How to add custom fields in invoices? In which database table the details are stored?

I am currently using trial version of Quickbooks simple start edition. I wanted to create custom fields in invoices. So I created a customized template in which i am able to change only the title of avilable fields. I am not able to indentify where the customized template details are stored?  How to add them through QODBC?

Can anyone help me?

Advance Thanks

See:
How can I create a custom field in the Customer table using QODBC? 
Where do the Vendor Custom Field Label Captions come from? 
How do I update Customer custom fields? 

The Template invoices are stored in the Template table, see:How can I create multiple lines in the Invoice, Purchase, Journal and other tables? for an example how to select a template.

I searched in the template table, i could see only the template name and is active field.

But i am not able to find where the caption for the fields given are stored?

When we create a custom template of invoice, we select the fields necessary and changes the caption of the field if necessary.

I could not find other details except template name and is active field in the template table?

I want to add a template dynamically through ODBC. That's why i am looking for this information

Help me.

Thanks in Advance

You cannot not create Templates, you can only say what Template you want to use when creating Invoices by using a TemplateRefListID:

INSERT INTO "InvoiceLine" ("CustomerRefListID", "TemplateRefListID","RefNumber", "InvoiceLineItemRefListID", "InvoiceLineDesc", "InvoiceLineRate", "InvoiceLineAmount", "InvoiceLineTaxCodeRefListID","FQSaveToCache") VALUES ('300000-1081400329','A0000-1045701421','56', '90000-1045537150', '4m Steel Ladder', 1.00000, 150.00, '90000-1045536338', 1)