RE: How would I hide fields in a report other than for...
We can hide the coloumn from the report with out formatting. when ever you are making the report the total columns comes in dataprovider in form of select query. those columns also appear in slice and dice section you can delete that column name from slice and dice which you want to hide.
if you want to take hide column again in future you can drop from report builder to slice and dice but in same sequence which is appering in dataprovider.
RE: How would I hide fields in a report other than formatting the cells?
You can do in Webi also. This is not the proper way but it is just a work around. Just make the backgroung color and text color white and minimize the width. you will only see a little gap in the report