I know I've missed something basic here.
=SUM([Contract Amt]1:[S- AWO $]1:[CL AWO $]1)-([Material Allowance]1:[Sub Allowance]1)/[Total FB Hours])
Thanks for help!!
The imbalance looks like it might be the result of the final close parens.
Another issue may be the use of ranges (colons).
SUM([Contract Amt]1:[S- AWO $]1:[CL AWO $]1)
should probably be
SUM([Contract Amt]1,[S- AWO $]1,[CL AWO $]1)
with commas instead of colons.
-([Material Allowance]1:[Sub Allowance]1)/[Total FB Hours])
-SUM([Material Allowance]1:[Sub Allowance]1)/[Total FB Hours]
as the range may not make sense without the sum function.