Find a Task in Timesheet

Dear Community,

I have a question about the timesheet in S/4. I would like to record time on a WBS element. In order to do so I tried to add the task to my list. However, when I tried to find the specific WBS element (we have hundreds of them) I could not find it with the search help. The search help only shows the WBS's that are initially loaded in the search screen. Is there a better way to find a specific WBS element in the timesheet app? Or could we prefill the task list with all WBS elements with a specific attribute?

Thank you for your help.

Regards,

Esmee