Sum of values in same chart

Hi,

I am pretty new to Power BI and learing more and more every day.

I am creating a report that will show me sales values depending on sales person, customer type etc. To do this I am using amounts from the ERP system where sales invoice lies in one table and sales credit amound lies in another table. This means I have to queries.

What I want to do: Sales person total amount = sales invoice amount - sales credit amout. I want to visualise each sales person's amount in the same chart.

Example data

https://1drv.ms/x/s!AnO0yKcIgtwGgcsBzanKGyX-D4riIA

Any suggestions?

Thank you!

Lisa