hey so i made a couple different walls that i will repeatedly be adding into my project what i am trying to accomplish is add these new meshes into the add mesh Archipack tab. see picture for more info?
It mostly depends on the kind of variations you want to achieve.
If it is related to wall general shape, such as L T predefined parts, you may use "custom objects" (mesh based closed volumes) as walls, this is a feature of 1.3.8+ 1.4_dev free versions for blender 2.79, available on github repository. https://github.com/s-leger/archipack/archive/140_dev.zip
In archipack 2.0 Pro version for blender 2.8, presets parameters exclude any "segments" one, as they are meant to quickly change wall's aspect (width / height / finishings, materials..) without changing the general shape.
Adding new kind of parametric objects to archipack is not an easy task as the archipack's framework require some time to getting started.