Need help with design and workflow

Good day.

I need help with my design. I want to manage my inventory/products in my warehouse.
Each user must be able to request or return stock and then it must either subtract or add the quantity returned or requested to that specific user account and list of products who created the request.

I then want to filter a repeating group showing the warehouse stock or each user and what stock they have with the quantity.

Can someone please help with this I am out of ideas.