hello all, Custom User Fields within Tulip are a really powerful feature that many users are not aware of.
I recorded a brief video showcasing an example app that makes use of this functionality, and only allows work orders to get assigned to specific users if they are certified to use forklifts. the video explains how to access the Custom Fields table for Users, how to create new fields, and how to use this information within the logic of your apps. take a look at the video here:
If you want to learn more about Custom Fields, you can take a look at this support article: https://support.tulip.co/en/articles/3586572-how-to-update-fields-on-individual-tulip-users-and-operators-from-apps 
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let me know if you have any questions!!
gio