Multiple Length, but identical Parts

I am designing an enclosure using Aluminum angles (long L-bars). At the moment, my workflow involves creating a new configuration for the L-bar part for each length I need (ex: 18" config, 17" config, etc).

Is there a better/faster way of approaching this? Moreover, I like how having different configs allows the BoM to list each one as a separate item.

Thanks.

SolidworksAssemblies