Quicksight - CUDOS dashboard custom visual with BU chargeback

Hi, We have setup out of the box CID and CUDOS dashboards which are great, but we have a use case to setup custom visuals to include BU charge back. In other words, our BU would be using a certain % for example 0.3 of total costs for our unblended account charges to calculate and pay back to the master payer account.

How could we set that up, any articles already exists ? TIA