You can use configuration publisher (built in function in SOLIDWORKS) in case you want to work with configurations and DriveWorksXpress (free add for design automation in every seat of SOLDIWORKS) in case you want to build them separately.
There are a few different approaches, however everything in SolidWorks starts with a sketch, is it what is called "Master Modeling" which is a combination of sketches and modeling or just use a sketch part "Skeleton Sketch" and focus on a top down design approach. See the attached pdf's..
As in any in context design, if you start the project wrong you will have a mess down stream, but if you follow the instructions very carefully you'll have great results. After your design process is complete, use the Pack & Go feature, use the search and replace for the next size etc...