composite workflow - start existing workflow many times

HI ,

i'm working on a workflow that create a AD User and put it into a Group.

i need to modify it : i want to create a AD User and put it in MANY  group

it is possibile to insert a variable (filed) where i can insert the number of groups in wich my User should be, and the workflow ask me the name on the group many time as indicatad in the field?

than you