Tricky Query For Joing Master-detail Tables

I need to write a sql query which is a master-detail query. Here's the example structure of tables:

Master table:
ColID as longint, ColA as int, ColB as int, ColPartID as longint, ColPartName as longint

Child table -- Wheel:
ColID as longint, ColA as int, ColB as int
Child table -- Door:
ColID as longint, ColA as int, ColB as int
Child table -- Window:
ColID as longint, ColA as int, ColB as int
..... etc

From the master table, it needs to join with its child in order to get the detailed information. However, there're more than one child table for it to join. In other words, the query has to choose the correct child table to join for each row selectively. The use of correct child depends on one of the columns in its master table (ColPartName).

My question is: Does it worth of me keep finding a solution for this query or should I abandon this? I really need some advice, please.

Many thanks,
Leonard