See picture enclosed, how would I snap these vertices to match the height of the taller one? I’ve always wanted to do this for different models.
Few ways you can do this.

Select all the 4 vertices and press S > Z > 0 (zero). This will scale all the 4 vertices to the same height with respect to the center of all four vertices. So if you had like 2 vertices above a horizontal line and 2 vertices below it, this will scale all the 4 vertices to meet on the horizontal line (just an example).

The other way is to press the “N” key and then read the Z location of the vertex you want to snap to. Once you know the Z value, you can assign that value individually to the three separate vertext. You need to be in edit mode to read the X, Y or Z values of vertices and the vertices needs to be selected.
This is a slower but more accurate process.
 Sometimes, holding Ctrl and moving your vertices around will constrain them to the grid units and might help with aligning.
1 Like
this is awesome thanks!!!
 snap the 3d Cursor to to the top vertex. (shifts > cursor to selection)
 set pivot point to cursor (period key)
 s > z > 0 > enter
GreyBeard
2 Likes