Assign account definitions in bulk

Hello,

I have an account definition that is not used for all and assigned only when needed. When we get the request for the assignments it may come in bulks. Does anyone know of a way to assign them in bulk through manager? I cannot see a way and don't want to have to create a dynamic role for the assignment. I think i would need to put in another column to identify the person if I did a dynamic role.

Thank you, Lu