In the "Salary Cap" style of fantasy game, players are all assigned a predetermined salary and then have a running total of salary spent (like in auction format) during a snake draft. 

FanDraft does not currently support this type of league ("Salary Cap"), where player's salaries can be manually entered prior to the draft.

FanDraft does support the ability for standard auction drafts though.
We encourage you to try out the free trial version of FanDraft to see if it meets your league's needs.