What reports can I generate in BUSY to cross-verify the GST returns data before upload?How do I generate GST returns on BUSY software?

If You are cross verify your data then you can check Gst Audit report from gst reports 
 Here are the steps to generate gst return from BUSY :
 Step 1: Go to Administration Menu
 Step 2: Click on Configuration option 
 Step 3: Then Click on Feature and option 
 Step 4: Then Click on GST/VAT feature 
 Step 5: Please ensure that your GST number is correctly entered in the GSTIN field
 Step 6: Make sure GST Portal username is accurately provided in the corresponding field located on the right side of the window.
 Step 7: Then go to Display Menu 
 Step 8: Click on Gst Reports 
 Step 9: Then click on gst Returns 
 Step 10: Then click on second panel of the option
 Step 11: Select the respective return that you want to generate.
 Step 12: This action will display five methods for generating the return i.e Direct Upload, JSON, CSV, Govt. Template, Plain Excel
 Step 13: Then select the appropriate method, specify the date range by setting the starting and ending dates
 Step 14: Then review for any errors. If errors are detected, proceed to resolve each of them.
 Step 15: Afterward, proceed to generate GST Return