I have re-edited the message....
I'm trying to add an endcap to this part... and I can create a sketch on the assembly but when I mate it I have to mate a top side and a right side of the part which leaves the bottom part and the left side of the part off in terms of the extruded holes... how can I draw in the assembly portion so that I can mate in plane from this part to the other part so I don't have to mate with faces, and rather with planes.. thanks in advance.
I'm trying to add an endcap to this part... and I can create a sketch on the assembly but when I mate it I have to mate a top side and a right side of the part which leaves the bottom part and the left side of the part off in terms of the extruded holes... how can I draw in the assembly portion so that I can mate in plane from this part to the other part so I don't have to mate with faces, and rather with planes.. thanks in advance.
This is only an assembly file, upload part files also.