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You will need to apply for the Global Entry system, separately and it's not considered an 'upgrade', even though you already have TSA Precheck. Here is how to get started with the GOES (Global Entry) online application:
The Global Entry may include TSA Precheck, if you choose to pay $15 additional, but since you already have TSA Precheck, that decision will be up to you. Both programs are good for 5 years, so if your Precheck is about to run out, it might be a good idea to include it in your GOES when you apply, so you have it for that much longer.
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