Parts made in Assemblies

I have several parts that I have created in an assembly and I want to take that assembly and re-save it as a new assembly and edit it. The issue I am having is that the parts are still link to the original assembly; so when change the height/length of a part the rest of the parts do not up date. So is there a way for me to unlink the parts from the old assembly but keep the references each part has to each other?

Thanks!

I want to avoid using a DT.

SolidworksAssemblies