Configure Sales Tax, Categories, Prompt Accounts, etc.
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For optional Receivables steps, configuring Taxes, Categories, Prompt Accounts, and Finance Charges, use the Customer/Configure window. Press F1 at any field where you need Help.
21st Century Accounting Knowledge Base
https://c21accountingsoftware.com/kb/
https://c21accountingsoftware.com/kb/viewtopic.php?f=11&t=300