TPS54020 verifying previous design, how do you vary ambient temperature?

I am verifying several TPS54020 designs that have already been implemented in a previous design.  I am using webench and having to make several changes to the design solution proposed by Webench to match the existing designs components.   After I have made these changes, is there a way to vary the ambient temperature without restarting the entire process?  When I go back to the beginning to vary the temperature, Webench will not let me find the components that have been used.