MULTIPLE IF CONDTITIONS OVER 64

Greetings!   I have a formula with more than 64 nested items and I need to simplify it so that I can reference a labor matrix.   =IF(B2=0.1,Gas!C35,IF(B2=0.2,Gas!D35,IF(B2=0.3,Gas!E35,IF(B2=0.4,G...