Merge Queries - Expanded Table uses a formula

Hello Community - 

I am in need of some assistance.  I have a step in Power query where I am merging queries.  Once merged, I am expanding a single column from that merged query which is a 'Bonus Rate'.  The end value needs to be a Bonus $ Amount.  Instead of having to create another step that would create a Custom Column to simply take the Salary ($) * Bonus Rate (which is the expanded column from the merged query), is there a way to nest the custom column step into the 'Expand Merge Queries' step? 

Currently My query step is this:

= Table.ExpandTableColumn(#"Merge Bonus Data", "Bonus", {"Rate with Vacancy Hedge"}, {"Bonus Rate"})

My next step would be to create the custom column, but I want to know if there is a way that I can take the step from above and tweak it to hace the "Rate with Vacancy Hedge" * Salary($) in the same step?

I have several columns where I need to do this, so ideally rather than having to create a custom column for each one, I would like to consolidate those steps.

Thanks in advance for any insights!

Ryan F