Linkage of Master Contact to Lower Level Contract

Guys, How can we link Master Contract to Lower level contract?

I have created first Master Contract with doc type Gk , there is field of Sales doc( Lower Level Contract) but its not Editable.

Then I Created Quantity contract with ref of Master Contract, still not any entry is being updated in My Master Contract,

I think Master Contract should show Linked Lower contracts, Please guide Me about this linkage, Necessary configs are already done.

With Regards,

M Jani