Sub Panel Ground Bars

I just converted a 125 amp GE panel from a main panel to a sub-panel. It is now connected (thru PVC conduit) to a 60 amp breaker in the main Square D panel in a detached building.
I separated the neutrals and grounds and only the grounds are bonded to the can.

It was much easier to add 3 ground bars in different areas of the panel than to pig-tail onto the ground leads and then all land on 1 ground bar.

Does code allow multiple ground bars?