Hi @Anonymous,
Hope you are well! 
Ok, so you finished with a project, and you now want to use that project with everything already setup (filters, families, panel schedules etc.) as the baseline for future projects?
My advice and the best way forward would be the following:
Open your finished electrical project file, then save it as a Revit Template File. (Revit Button Dropdown, top-left >> Save As >> Template)
Save the .rte (Project Template File) with an appropriate name e.g. - ELECTRICAL - Project Template - REV 0, commonly under your Company Standards >> Revit >> Electrical Templates (Something to that effect).
This template would then form the baseline for all your new electrical projects going forward.
Now for the "clean-up", go to Manage >> Settings >> Purge Unused. (Example Below)

After you happy that all Families, Groups and Other Styles are removed, you have a "cleaner/smaller template". What you could also do is in your Project Browser, scroll down to your Families, Groups and Links and right-click and delete unrequired elements/instances.
Because this is a new project template, none of the existing systems in your System Browser matter as it would differ from one project to the next, so you can delete the elements. OR for a quick way and to make sure that you remove everything, go to your default 3D view, go to your Visibility/Graphic Overrides (VV or VG) and make sure that everything is visible. Select everything and delete it. You'll need to go to each plan/ceiling view to delete some of the annotations and also wiring.
I'll then go to Manage >> Settings >> Purge Unused one last time, then make sure that everything which you do not require is purged.
Then Save the .rte file. Now, going forward, whenever you start a new project, you go to New >> Browse >> Select the above-mentioned template file >> Open as a Project. Then from there you link the architectural model in etc.
Whenever you need to change something (like filters etc.) or whenever you need to add additional families to be used on projects. Add them to your Project Template file, then simply transfer project standards. This way, everyone working one electrical projects in your company would work on the same standards and all of the latest standards would be available to anyone.
I hope this helps! 
Rudi Roux
MSc | Digital Engineering Manager
LinkedIn
Revit Mechanical & Electrical Systems 2018 Certified Professional | Revit MEP & Architecture 2015 Certified Professional
AutoCAD 2015 Certified Professional | Autodesk Building Performance Analysis (BPA) Certificate
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