Please note, you will need to be an admin to complete these steps.
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1. Navigate to Settings > Admin
2. Click on Setup > Integrations
3. Click the checkbox next to the line that says, "Allow field users to add phase/cost codes?"
4. Finish up by clicking SAVE CHANGES !

Interested in making this a REQUIRED field for users? Vote for it here: https://kojo.uservoice.com/forums/938184-jobsite/suggestions/45361192-required-phase-cost-code-category-toggle