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I guess it depends how much you want to do. The simplest way would be to extract just the meshes from FullBuild0.package, alter them, and then import them into a new package file using the same group/instance as the originals.
That would work for simple alterations, but if you need, for example, to do new morphs, new textures etc. then you'd have to do it differently. In that case, I would suggest creating a new top based on the OLS top as if you were making a completely custom outfit, and then changing the instance of the CASP so it's the same as the OLS top's instance. Either method will create a working default replacement.
What I lack in decorum, I make up for with an absence of tact.