Adding Party Type and Party DocType in Journal Entry

Hello,
I want o add Party Type and Party DocType in Journal Entry. Let me explain my case first: we have some rental properties for our offices. Now I want to create “Property Owners” under Party Type and list of owner names under “Party”. How can I do this?
Can anyone please help?

Arent they same as “suppliers”? Everyone I know using any erp system considers it as such. So why do they need to a different party?

They are not ‘Supplier’. In the case of suppliers’ we need to generate supplier invoices, material receipt,s etc. besides suppliers are associated with VAT, but these rental properties are not associated with VAT.