I'm afraid there are no simple shortcuts for you. You will need to individually create all of your parts and assemble them. Your 2D assembly can be useful as a "layout" sketch, but that's about its only use. You can do "top down" part creation in a SolidWorks assembly file using selected elements as sketch basis for each part. Use the Convert tool on the sketch toolbar, and if you want to make the part feature sketches independent of the assembly (recommended) you should delete all On Edge relations and constrain the elements yourself using geometry relations and dimensions. Check out the 2D to 3D tools in SolidWorks as those may be useful to you, depending on how complex is the geometry of your parts. Otherwise, if you have lots of such work to be done your company should probably consider farming it out to services that specialize in 2D to 3D conversion. Some of those are located in India, and are thus quite cost-effective.
Mark 'Sporky' Stapleton Watermark Design, LLC http:/