I have an assembly drawing, model consisting of one weldment, one subassembly, two hydraulic cylinders, four HHCS, four nuts and four lockwashers. I have a top level BOM. The cylinders (in the real world are identical) have a left and right configuration. The only difference is the cylinders are rotated axially, so that the hydraulic fittings face the rear of the assembly. I have the cylinder model with two configurations, right and left. I am using the document name in the BOM. The  cylinder show in the BOM as two separate item numbers. Is there some way to force a combine of these two items?