MPLABX marking a file as an entry point

[sairfan1]

I believe i did this before but forgot. I have a file mymain.c and it has the main function, I want to make this file as an entry point to compile and run the project in MPLABX 6.x with XC compiler.
By default mplab considers main.c as an entry point I did this before but forgot where to find the option to point some other file as starting point for my project.