How to Freely Move on a separate face

I need to get all of these half circle trapezoidal shapes onto a sheet for waterjetting. So far I have jointed them to the rectangular sheet but now if I try to move them on the sheet I can't. They aren't grounded and if i try to move them, it just moves an imaginary bod (i think?). Please help, thanks!

https://preview.redd.it/janzfmd4jxsf1.png?width=2469&format=png&auto=webp&s=8bbfbd00158b291053f19e6771fed75f3ddfe0f1