SAP B1 Child Table to System Table

Hi experts,

I have created some user defined fields on System form (Employee Master Data) and created an user defined table as MasterDataLines.

Now, I want to associate the my table to OHEM table.

So I want to use my table as child table of system table.

This is the Employee Master Data form and my fields.

How can i do this ?

Thanks for your helps.

Regards.

Ahmet