In Yuman, billing categories enables you to analyze your company's financial results and the contribution of each of your activities to your results.
You can add your assignment accounts in Yuman. Go to the Settings tab > Billing Categories and complete the table with as many accounts as you need.
You will then find this data in the invoices: the "Billing category" box allows you to allocate each invoice to an account.
You can also perform an analytical allocation per invoice line. In this case, go to Settings > Preferences, section Invoicing and make sure that the box Allow analytical imputation by line is checked.