The entry boxes in the ACBC software interface for specifying base price and level prices for attributes can accept either specific numeric values or script. The script can just be Sawtooth Script: for example, the [% ... %] stuff for returning answers to previous questions. [% Q1 %] returns the answer to numeric question Q1. Or [% Q1+3 %] returns the answer to number questions Q1 plus 3. You can refer to answers to previous questions. You can also use mathematical operations. You can use the ROUND Sawtooth Script to round to specific values too.
Test thoroughly to make sure data collection and utility estimation seems to be working properly for test subjects!