OK, sorry for the delay, let me try to be clear.
In the new image attached it shows the room set up, box of 3 on top, box of 4 on bottom. All were pre-existing and worked fine, I just replaced the 7 switches (they were old & nasty & wrong color for room). I tried duplicating exactly what was already there but obviously did something wrong when wiring the switches.
After replacing the box of 3 on top first, all worked fine, so those must be wired properly.
For the box of 4 on the bottom, the 2 on the left are 3-way, the 2 on the right are 2-way (I used all 3-way switches because that is what was there).
To the best that I can tell, each switch has its own group of 3 wires (red, black, white) coming from the back of the box, with all white wires tied together and covered with a plastic cap. I didn't create the setup, and its worked for the 8 years we've lived in the house, so it must work if wired properly.
So, the questions:
1-Must I replace the two 2-way switches on the bottom right with 2-way switches, or can it be wired using 3-way and just leave one post unused?
2-How do I wire the 4 black and 4 red wires coming from the bottom?
3-How do I connect the 4 switches in sequence?
Thanks for all your help.