Now that you have done the following...
•installed PTI
•set your PTI Preferences,
•have edited your Descriptive Text so that text from the AyaNova workorder shows on the Peachtree invoice if desired
•have linked existing data between AyaNova and Peachtree
•and/or imported Peachtree data (customers, vendors, items) into AyaNova
•and/or imported AyaNova data (clients, vendors, rates, parts) into Peachtree
... now you are now ready to invoice AyaNova workorders into PeachTree invoices.
To invoice AyaNova workorders into PeachTree invoices, all you have to do is:
1. Make sure your Peachtree program is running on your computer with your Peachtree company data file open
2. Start the PTI program from within the AyaNova program from the Plug-Ins menu if not already running
3. PTI will read the Peachtree data in, and then you click OK to confirm this is the Peachtree company data file to use
4. Then select from the PlugIns again
5. And click on PTI Main to bring up PTI Main screen
If it states no invoiceable work orders found in AyaNova, but you do have workorders that need to be invoiced, then you need to check as per the message and as per the section No service workorders ready for invoicing
If it displays client names and workorder numbers with a red X 
beside them, that tells you that you have either clients not linked between AyaNova and Peachtree, or parts not linked, or parts with different prices etc. Refer to the section Fix unlinked objects or parts with differing price for details
If you want a single AyaNova workorder to be invoiced out in a single Peachtree invoice
If you want multiple AyaNova workorders for the same client to be invoiced out to a single Peachtree invoice
If you have a number of service workorders all for different clients ready for invoicing, you can have PTI have Peachtree invoice all workorders at one time into respective invoices
Refer to What happens when PTI invoices?