Unable to link existing invoices / bills to project

Unable to link existing invoices / bills to project

I created a new project under an existing customer and initially set up the billing method as "based on staff hours". The project scope changed and I did not enter any timesheets or billable hours under the project. I used a 3rd party subcontractor to do the the work, and they invoiced me for the costs. 

I uploaded the 3rd party invoices as bills and added the customer details. Then I created invoices, linked the relevant bills to the invoices and sent to my customer. When I created the bills and invoices, I did not specify the specific project, I only identified the customer. I need for the bills and invoices to link to the specific project but I have been unable to do so.

When I try to edit the bill to add project details, I receive an error the "Invoiced items cannot be deleted/changed". Zoho support suggested that I edit the invoice, but when I update the project on each invoice line, it does not save.

Can anyone help with this or advise how I can link these invoices and bills to my project?

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