You should first finish mapping the organisations to their respective clients so you can mark every cost needed in one go.
Once mapping is complete:
Go to Costs.
Click on Pending Action.
Find the costs in question.
Tick the box on the left of each cost.
At the top, click Track as non-billable.
Important: Once a cost is marked as non-billable, it cannot be reverted. It will move to the Non-billable tab, and the only option available from there is to delete it.
Marking costs as non-billable in Practice Connect is important for keeping your cost tracking clean and accurate:
It clearly separates which costs are for internal tracking only versus those that should be linked to clients as billable.
It helps your team avoid confusion later by showing exactly which costs are excluded from client billing.
Because this action cannot be reversed, it ensures a reliable record of how each cost was classified.