When billing a file, the fee earner Name dropdown should list all the fee earners able to work on the case type of the matter being billed. But if it only lists 'None' there is a set up issue within System Matrix.
This dropdown appears when, within the Posting Allocations window, you click on the View WIP & Set Nominals button. This brings up the Posting WIP Details window. In here, click on the orange plus ('+') button to bring up another window. In here is the Name dropdown.
If the dropdown just shows 'None' then there is a set up issue within System Matrix. There will be missing Fee Earner entries. There should be:
Description: Fee Earner Field name: Fee Earner DNA Name: Description
Description: Fee Earner Code Field name: Fee Earner DNA Name: Code
Description: Fee Earner Login Name Field name: Fee Earner DNA Name: Login ID
Create these three entries for all case types that create Accounts ledgers and exit. All other users would need to log out and back in again. If no user has had the relevant training and does not have access to System Matrix, then log a Support call.