Is their any way to mirror the vinyl group from left to right side of the car so you don’t have to do it twice?
Yes?
Apply the group to the right side of the car.
Go to left side and choose the “bring all layers from other side” option.
Now copy all the layers while still being on left side.
Go back to right side and paste.
You should have the group mirrored there now.
There is just an option to insert all layers from other side i think like Eddy FIN was describing, it’s what i use except it doesn’t work on text