As Jon_Israel pointed out, this functionality does not exist at the present as SLA's are driven by choices made for the affected end user, category, and priority values. Can you provide an example of what you are trying to do? What are the sort of questions that could be raised, and how would the responses to those questions drive which SLA should be introduced?
A thought along the lines of PAM is to build a custom web services application that does the interpretation of the questions being fielded and generates the appropriate SLA which can then be used in a call to create a ticket, but it would be simply an overlay to the SDM interface, which does not provide this functionality natively.