How to create relation with parent and child table ?

Hi All,

I have created

1 parent table

A (ID,SKU,Name,ShortDesc) and

4 child table :

B(ID,A_ID,LineID,Code,Name)

C(ID,A_ID,LineID,Code,Name)

D(ID,A_ID,LineID,Code,Name,Option)

E(ID,A_ID,LineID,ItmGrpCode,ItmName,ItemChild_SKU)

Now i want to relation child tables(B,C,D,E) with parent table(A) and bind the form fields with the table columns.Please help me how it can be possible ?

Thanks

Surajit