Google Drive to Shared Drives bulk move

Your command looks OK, but note that you need / not \ in the remotes. Note also that google drive is case sensitive so testupload1 is a different directory to Testupload1.

Here is an example

ncw@dogger:~$ rclone lsf TestDrive:
A1/
GDocs/
README.md
src/
test/
$ rclone size TestDrive:test
Total objects: 1004
Total size: 159.414 MBytes (167157637 Bytes)
$ rclone size TestDrive:test/test-2612
Total objects: 1
Total size: 64 MBytes (67108864 Bytes)

To copy a subfolder you specify the path to it and you specify the same path in the destination (assuming you want to keep that directory structure).

rclone copy TestDrive:test/test-2612 destination:test/test-2612 

This copies the contents of TestDrive:test/test-2612 to the folder destination:test/test-2612