Vocal Parts Am Hard

I Am arranging the harmony for Here Without You this morning and my voice is already shot. I don't last very long specially if I do each part over and over. So little time and so many songs......

Why so little time? 
Bayoubond.. in "The Time Is Not Enough".

or....Nitrain- "Take the Last Train To Clocksville"

Looking forward to hearing your group Bill.

Singing from the head and throat will stress the cords and burn out the voice is short order.... singing from the chest and diaphragm will not. You can sing all night and still talk afterwards. 

What Herb said will help a lot.  There should be some pretty good warm-ups for singing posted somewhere.  Since I only do voice-overs, I tend to only use one exercise called the "King Kong" warm-up.  For that one you simply say the following starting in a fairly low register (and varying the order on subsequent repeats):  "King Kong," (then lower) "Bing Bong," (then even lower) "Ding Dong."  On the final word of each set (in the case shown, "Dong") lengthen the word and stretch it lower and lower until it becomes unrecognizable.  Think of this as if you're stretching a muscle gradually.  The next set you should find you can go a little lower, and so on.

This exercise naturally helps with the lower tones and a bit with projection but, I'm sure, that the singing ones will help with your breathing and where you're supposed to sing from (body part-wise - a singing coach can describe this area a lot better than I can!  LOL!).

Who knew there was so much to singing?  

My daughters were in the high school chorus and I used to hear them practicing...always doing the vocal warm ups.... I thought it sounded strange but now I know what it does and how important it is to not only warm up but to use good practices and techniques to get the most from the voice we are born with. 

Back in the "live gigging" days, we simply walked on stage and started the 4 hr show without too much thought to the mechanics of it. There were a few of us who could sing...some better than others, and the rest we kept away from the mics as much as possible. 

Now that I'm into studio recording, singing has taken on a totally different aspect. Quality is more important now than it was back in the club circuit.  So I have tried to learn a few things and apply them. 

I got the parts recorded and my voice is intact. Whew! Getting them right was much work but I think the guys will like what I did. Thanks for the input everyone! It's greatly appreciated!!!  
 

I have taken your advice! The forementioned is on the minimized track and I have been working on "the SOUND"