Hello,
 
I'm not sure I quite understand your question, are you asking how to do a nested if statement, possibly? You would be able to accomplish this using the expressions tool using the function browser in the context browser. Here's a link to help you get acquainted with that: 
http://help.k2.com/onlinehelp/k2blackpearl/userguide/current/webframe.html#logical.html
 
Here's some other forum posts that may help you as well:
 
Nested if statements
http://community.k2.com/t5/K2-blackpearl/Nested-if-statements/m-p/71556#M20552
 
How to write Nested-if conditions in K2 smartforms (Column level Expressions)
http://community.k2.com/t5/K2-blackpearl/How-to-write-Nested-if-conditions-in-K2-smartforms-Column-level/td-p/71304