What The Tcode To Design Report In KE30

Which tcode to edit the design of the report in ke30?

Why when execute the report in ke30, no variant and all report not able to run despite parameter entered?

In COPA, before creating report, you have to define forms.

For forms check this t.codes:

KE34 - Define Forms for Profitability Reports

KE94 - Define Forms for Reports Based on Line Items 

Reports check this t.codes.

KE31 - Create Profitability Report

KE91 - Create Report Based on Line Items

KE32 - Change Report