Add Custom Logic To Bulk Upload child table

Any hints where to start if we want to add some custom logic while bulk-uploading child table?

I know we can download the template and follow the template but my case is … csv/excel file is raw data so I need to manipulate it before it can be rendered to item table…When user select excel file and click upload…how to put custom .py function? Can we use custom script to frappe.call the .py function?

Thanks

Hello @jof2jc

Did you find the way?

Regards
Bilal