i signed set up new work phone under my personal apple id. i now want to delete that and set up a work apple id for the work phone how do i do it. iphone6.

You can wipe the iPhone and start over:

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

Or

You can sign out of your Apple ID from all services:

Settings->iTunes & App Stores->Apple ID

Settings->Account(top of settings)->Scroll Down to "Sign Out" for iCloud.

Settings->Messages->Send & Receive->Apple ID

Settings->Facetime->Apple ID

Then you can go to any of those locations and Select Create new Apple ID in the Sign in Menu.

Sign in with your Apple ID - Apple Support

Note that doing with will not delete any content, and any Apps downloaded with your other Apple ID will remain tied to it, and require it to update.