is there a way to remove the last line of total and average.I also want to eliminate 0 if shown in a report

I assume that you mean on table reports?  The feature of it a column shows totals or averages is set on each of the field's field properties on the report.

As for the zeros, are these summary totals showing off a relationship?  If so, then  you can adjust the summary fields to not include children with zero values.