I have just put a new patio and I have wire drops for 4 ceiling fans with lights.
The wire is 14/3 so that I can switch fan and light seperatly. Can all four go on one new 15 amp circuit? How do I attach 3 wire at the box for the new circuit.
Also I will not be using a wall switch only a remote?
Any help would be greatly appreciated.

The four fans will fit fine on a 15 amp circuit, each fan is probably about only 1 or 2 amps each. What needs to be considered is the lighting. Assuming each fan uses three 60 watt lamps, one lamp is .5 amps, for a total of 6 amps for 12 light bulbs. If each fan draws 2 amps, times four fans + 8 amps, plus the 6 amps for lighting totals 14 amps.

So, check the amp load of each fan and be careful of the total lamps you will use. You may want to consider using smaller lamps or even use compact fluorescent lamps.

At the switch location, I assume you will have two switches, one for fan and one for lights, and I assuem you have a feed cable. The white connects to the feed white (neutral), the feed hot feeds one terminal on each switch, and you can connect the black of the 3 wire cable to one switch and the red to the other switch. The switched black and red can be used for wither all the fans or lights, color code does not matter here.

If you are using remotes and not wall switches to control the fans, you can use 14/2. However given the reliability of most remote fans I would advise against this.