You can Right Click, Edit Table Calculation and then Table (Across)
Not sure if you meant on the Table Calc calculated field that I had already done that on or on the calculated field that was a simple sum and contained no table calc in its own code, but your comment got me to check if I could do the latter and I can. It appears that that works and if that is what you meant thanks!
I swear I used to be able to set defaults in the Measures area that were saved and used everywhere. Can anyone explain how this change is an improvement. It is less intuitive and if I remove a variable and then put it right back I have to retell it how to calculate each time.