Stop excel users from inserting or deleting rows with 3 methods covering normal protection, only protecting rows and columns, or VBA and protect free stops.
Sum all the negative numbers in Excel by adapting a SUMIFS function with tricks that will tell Excel to look for numbers smaller than zero (and similar)
Change the name of items directly in the Pivot Table, so that the Pivot Table remembers it and applies your preferred name going forward without touching the database