https://www.zoho.com/us/billing/kb/time-tracking/invoice-timesheet.html
Raising an Invoice for a Timesheet | FAQ | Zoho Billing
Learn instances under which you will not be able to invoice a timesheet in Zoho Billing.
raising an invoicetimesheetfaqzohobilling
https://www.ireg.com/kb/servlet/KBServlet/faq511.html
Raising an Invoice | KnowledgeBase
raising an invoiceknowledgebase