transferring UDFs between companies

Hello SAP experts.

I have sorted my UDF's, but, as I am using trial and error I always have to use the Test System first (which is a duplicate company used for practising), the info needs to be transferred over to the main company.

I noticed that if I want to just manually add these again to the main company i need other users to log out. What's the best way of doing this?

thanks