form development

n my form three fields are there in that 2 fields from one datasource … and another onefield which is unique(1 to n relation to another datasource ) from another datasource …
now in my new form i wanna three fields

how to get it

Are you working with list page type form ? If yes, then take a query and attach it to form and try creating design with all your 3 fields.

will u please elaborate that

I am working with simple list details