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Overkill will do that. Just check the box for "Combine co-linear objects that partially overlap".

You should learn how to use blocks with attributes for your titleblocks. Then put that field in one attribute ( or make it the default value ) and all your sheets will automagically number themselves. Code is not needed for this simple task.

The fillet command is another option. Using Shift+pick ensures Radius = 0.

Assuming you're trying to eliminate points that shouldn't be included in your surface there's no need to erase them. Simply Exclude them from the Surface definition. In Civil 3D Toolspace Prospector tab → Surfaces → "your surface name" → right-click → open Surface Properties… → [Definition] tab → Build → set 'Exclude elevations less than' to Yes → set 'Elevation >' to 1.00 I also keep 'Maximum angle between adjacent TIN lines to 130°.

I am not sure what it is your trying to do the one rule nearly everybody pushes is draw real size not scaled. That is why layouts have MVIEW.

This might be what you want: OCS command of outside Polyline https://www.cadtutor.net/forum/topic/17902-select-inside-of-a-polyline/