perforce merge branch

To merge changes from the secondary to the main branch

• make sure you have both the main and secondary branch in p4 client
• go to the main branch directory 

p4 integrate /file/path/to/secondary/branch/file.ext /file/path/to/main/branch/file.ext

p4 resolve  /file/path/to/main/branch/file.ext

p4 submit