How to restrict deliver to locations under Requisition preferences

Hello,

We would only like to see 50% of locations when selecting the 'Deliver-to location'.

Is there a way to restrict the user from seeing the full list of locations.

We have tried a data set but it still shows every location we have.

We have also tried to turn off the bill to/ship to enabled but it still shows.

Has anyone got any suggestions to restrict some locations from being selected?

Many thanks,