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I haven't used inventor, but normally what you do in parametric CAD programs is create a new file for each type of part. The idea here is that eventually you will want to print off real, dimensioned, CAD drawings of each part. When designing a fairly simple chasis, I ended up with about 37 different files for all the various lengths, angles, etc.
For a rectangle, you really only need two files: one for the long side, and another for the short.
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