Hi, Vicky
DRAW business object (the BOR for DMS Document) has LABORATORY attribute,
which has AGENTS attribute.
Thus, if you have an instance of DMS document in your workflow, you can use this expression:
&DRAW.LABORATORY.AGENTS&
to get the list of org management objects (work center in your case) attached to your Laboratory (provided that 'DRAW' is the name of the container element).
It should be definitely possible to set agent determination for a dialog workflow step with this expression. (and no coding!).
But since you want to send mail only, this might be more complicated:
You might try using this expression to define recipients in a 'Send Mail' step, but I'm not sure it is going to work (will work center be evaluated into particular users or not). If it doesn't work, you'll need some code to do this evaluation yourself (RH_STRUC_GET)..