diff --git a/src/cascadia/TerminalApp/AppCommandlineArgs.cpp b/src/cascadia/TerminalApp/AppCommandlineArgs.cpp
index e9b6368ff0b..2fa36a9711f 100644
--- a/src/cascadia/TerminalApp/AppCommandlineArgs.cpp
+++ b/src/cascadia/TerminalApp/AppCommandlineArgs.cpp
@@ -568,6 +568,9 @@ void AppCommandlineArgs::_addNewTerminalArgs(AppCommandlineArgs::NewTerminalSubc
     subcommand.colorSchemeOption = subcommand.subcommand->add_option("--colorScheme",
                                                                      _startingColorScheme,
                                                                      RS_A(L"CmdColorSchemeArgDesc"));
+
+    subcommand.appendCommandLineOption = subcommand.subcommand->add_flag("--appendCommandLine", _appendCommandLineOption, RS_A(L"CmdAppendCommandLineDesc"));
+
     // Using positionals_at_end allows us to support "wt new-tab -d wsl -d Ubuntu"
     // without CLI11 thinking that we've specified -d twice.
     // There's an alternate construction where we make all subcommands "prefix commands",
@@ -654,6 +657,10 @@ NewTerminalArgs AppCommandlineArgs::_getNewTerminalArgs(AppCommandlineArgs::NewT
     {
         args.ColorScheme(winrt::to_hstring(_startingColorScheme));
     }
+    if (*subcommand.appendCommandLineOption)
+    {
+        args.AppendCommandLine(_appendCommandLineOption);
+    }
 
     return args;
 }
@@ -699,6 +706,7 @@ void AppCommandlineArgs::_resetStateToDefault()
     _startingTabColor.clear();
     _commandline.clear();
     _suppressApplicationTitle = false;
+    _appendCommandLineOption = false;
 
     _splitVertical = false;
     _splitHorizontal = false;
diff --git a/src/cascadia/TerminalApp/AppCommandlineArgs.h b/src/cascadia/TerminalApp/AppCommandlineArgs.h
index 31eac78168b..292a3500c42 100644
--- a/src/cascadia/TerminalApp/AppCommandlineArgs.h
+++ b/src/cascadia/TerminalApp/AppCommandlineArgs.h
@@ -67,6 +67,7 @@ class TerminalApp::AppCommandlineArgs final
         CLI::Option* tabColorOption;
         CLI::Option* suppressApplicationTitleOption;
         CLI::Option* colorSchemeOption;
+        CLI::Option* appendCommandLineOption;
     };
 
     struct NewPaneSubcommand : public NewTerminalSubcommand
@@ -105,6 +106,7 @@ class TerminalApp::AppCommandlineArgs final
 
     // _commandline will contain the command line with which we'll be spawning a new terminal
     std::vector<std::string> _commandline;
+    bool _appendCommandLineOption{ false };
 
     bool _splitVertical{ false };
     bool _splitHorizontal{ false };
diff --git a/src/cascadia/TerminalApp/Resources/en-US/Resources.resw b/src/cascadia/TerminalApp/Resources/en-US/Resources.resw
index 80f0a9df574..6834eff5847 100644
--- a/src/cascadia/TerminalApp/Resources/en-US/Resources.resw
+++ b/src/cascadia/TerminalApp/Resources/en-US/Resources.resw
@@ -840,4 +840,7 @@
     <value>Run as Administrator</value>
     <comment>This text is displayed on context menu for profile entries in add new tab button.</comment>
   </data>
-</root>
\ No newline at end of file
+  <data name="CmdAppendCommandLineDesc" xml:space="preserve">
+    <value>If set, the command will be appended to the profile's default command instead of replacing it.</value>
+  </data>
+</root>
diff --git a/src/cascadia/TerminalSettingsModel/ActionArgs.h b/src/cascadia/TerminalSettingsModel/ActionArgs.h
index 87e1ac4fcfe..5633c039469 100644
--- a/src/cascadia/TerminalSettingsModel/ActionArgs.h
+++ b/src/cascadia/TerminalSettingsModel/ActionArgs.h
@@ -309,6 +309,7 @@ namespace winrt::Microsoft::Terminal::Settings::Model::implementation
         ACTION_ARG(Windows::Foundation::IReference<Windows::UI::Color>, TabColor, nullptr);
         ACTION_ARG(Windows::Foundation::IReference<int32_t>, ProfileIndex, nullptr);
         ACTION_ARG(winrt::hstring, Profile, L"");
+        ACTION_ARG(bool, AppendCommandLine, false);
         ACTION_ARG(Windows::Foundation::IReference<bool>, SuppressApplicationTitle, nullptr);
         ACTION_ARG(winrt::hstring, ColorScheme);
         ACTION_ARG(Windows::Foundation::IReference<bool>, Elevate, nullptr);
@@ -320,6 +321,7 @@ namespace winrt::Microsoft::Terminal::Settings::Model::implementation
         static constexpr std::string_view TabColorKey{ "tabColor" };
         static constexpr std::string_view ProfileIndexKey{ "index" };
         static constexpr std::string_view ProfileKey{ "profile" };
+        static constexpr std::string_view AppendCommandLineKey{ "appendCommandLine" };
         static constexpr std::string_view SuppressApplicationTitleKey{ "suppressApplicationTitle" };
         static constexpr std::string_view ColorSchemeKey{ "colorScheme" };
         static constexpr std::string_view ElevateKey{ "elevate" };
@@ -340,6 +342,7 @@ namespace winrt::Microsoft::Terminal::Settings::Model::implementation
                        otherAsUs->_TabColor == _TabColor &&
                        otherAsUs->_ProfileIndex == _ProfileIndex &&
                        otherAsUs->_Profile == _Profile &&
+                       otherAsUs->_AppendCommandLine == _AppendCommandLine &&
                        otherAsUs->_SuppressApplicationTitle == _SuppressApplicationTitle &&
                        otherAsUs->_ColorScheme == _ColorScheme &&
                        otherAsUs->_Elevate == _Elevate &&
diff --git a/src/cascadia/TerminalSettingsModel/ActionArgs.idl b/src/cascadia/TerminalSettingsModel/ActionArgs.idl
index d38e3011281..271c9d979d8 100644
--- a/src/cascadia/TerminalSettingsModel/ActionArgs.idl
+++ b/src/cascadia/TerminalSettingsModel/ActionArgs.idl
@@ -132,6 +132,7 @@ namespace Microsoft.Terminal.Settings.Model
         String TabTitle;
         Windows.Foundation.IReference<Windows.UI.Color> TabColor;
         String Profile; // Either a GUID or a profile's name if the GUID isn't a match
+        Boolean AppendCommandLine;
 
         // We use IReference<> to treat some args as nullable where null means
         // "use the inherited value". See ProfileIndex,
diff --git a/src/cascadia/TerminalSettingsModel/TerminalSettings.cpp b/src/cascadia/TerminalSettingsModel/TerminalSettings.cpp
index aaa151d9cf2..c594d42fb3b 100644
--- a/src/cascadia/TerminalSettingsModel/TerminalSettings.cpp
+++ b/src/cascadia/TerminalSettingsModel/TerminalSettings.cpp
@@ -129,7 +129,14 @@ namespace winrt::Microsoft::Terminal::Settings::Model::implementation
             // Override commandline, starting directory if they exist in newTerminalArgs
             if (!newTerminalArgs.Commandline().empty())
             {
-                defaultSettings.Commandline(newTerminalArgs.Commandline());
+                if (!newTerminalArgs.AppendCommandLine())
+                {
+                    defaultSettings.Commandline(newTerminalArgs.Commandline());
+                }
+                else
+                {
+                    defaultSettings.Commandline(defaultSettings.Commandline() + L" " + newTerminalArgs.Commandline());
+                }
             }
             if (!newTerminalArgs.StartingDirectory().empty())
             {