How to specify output Coordinate as a parameter for Project tool

[LoriKoepsell1]

In model builder, how do I make the Output Coordinate System of the Project tool select the proper coordinate system based on a UTM zone parameter?  We have Lat/Lon (WGS84) coming in as Input Coordinate System but the model will have an output coordinate system that corresponds to the proper UTM zone (WGS84) each time the model is run.  We want to have the model select the proper coordinate system based on the UTM zone.  But how do we tell the output coordinate system variable of the project tool to get its input from a parameter variable? 
Thanks for any help on this.  -Lori

[NobbirAhmed]

Could you please be more specific with some examples?

What values are provided for the 'UTM Zone' parameter? The name of the coordinate systems? Like this 'WGS 1984 UTM Zone 11N', 'WGS 1984 UTM Zone 12N', 'WGS 1984 UTM Zone 13N' ... ?

And then you want the model to select which UTM coordinate system to use?