I need a little bit of help to move my command in the same section of copy/paste (context menu).
I tried to copy the parenting of Copy command that can be found in ShellCmdPlace.vsct without success.
<Group guid="guidSHLMainMenu" id="IDG_VS_CTXT_CMDWIN_CUTCOPY" priority="0x0100">
<Parent guid="guidSHLMainMenu" id="IDM_VS_CTXT_COMMANDWINDOW"/>
</Group>
The only thing that I modified in my vsct file to obtain the result of the screenshot is the parent id of my menuGroup:
<Groups>
<Group guid="guidCommand1PackageCmdSet" id="MyMenuGroup" priority="0x0500">
<Parent guid="guidSHLMainMenu" id="IDM_VS_CTXT_CODEWIN"/>
</Group>
</Groups>
Thanks!

You can go to Tools > Customize and find this in Context menu in Commands tag:
Then find your command and use Move Up or Move Down to move it: