How to add relations with fileds for bookmark?

Hello All,

I want to add application bookmark on offerletter .

I have added applicant Id and there Job on offer letter because HRMApplication and HCMJob have relation,

but i am not able to add applicant name and department because there is no direct relation for HRMApplication and dirPartyTable.

So , can you please help me how to add relations on document Type and how to add applicant name and address on offerletter