Hi,

Unfortunatly you need to specify destinations at design time. Meaning that you can either use users/groups/roles, or you can use repeating xml nodes in the destination and set the value of the xml at runtime.

Please check the links below for more detail on this:
http://www.k2underground.com/media/p/20948.aspx

http://www.k2underground.com/blogs/fromthebench/archive/2008/05/22/activity-destination-users-based-upon-a-repeating-xml-element.aspx

If this is not what you are lloking for, please provide us with more information.

hth,