1. Log into 1Stop. Go to Setup > Customization > Modules and Fields. Click the Global Sets tab at the top, then scroll down to the Sales Rep List and click it.
2. Hover your mouse to the right of the picklist field, then click the + icon.
3. Add the Sales Rep's name and click Save. To add more than one name, click the + icon again for each additional entry.
Alert
To avoid any issues, please keep all names in the Global Set, even if someone is no longer with your company.