To add a supplier:
Go to Inventory → Suppliers in the management console.
Type supplier company name.
Enter supplier's EIN — 9 numbers.
Enter phone number and address and add a comment.
💡 Creating suppliers is available during supplying products as well. Click Add in Inventory → Supply and choose Add new supplier from the drop-down list in the Supplier field.
To work with suppliers in debt, use the extra financial account.