Can we make a child table field to allow bulk edit from read only

Is there any way to make a child table allow bulk edit from read only.
for eg i have a parent doctype ABC and inside that i have a child table xyx (xyz is read only)
So i want to make xyz as allow bulk edit instead of read only i tried to make that in customize form but it is not allowing me to change
Regards,
Sheetal Pawar