Can i add grid to a fix/inspect form?

I have an existing fix/inspect form.  i want to add a one-many relationship to it.  So the existing record on the fix/inspect has a field called sport and right now it's a 1-1 relationship.  i want to make it a 1-many relationship so i'll create a new table that contains additional sports.

On the form, everything stays the same, i just want to add a grid at the bottom of the form so users can enter in additional sports for a user.

Can i do this on the fix/inspect form? I want to just modify the form if possible instead of creating a new one like headerless/detail.