Odoo Community Edition does not provide a built-in drag-and-drop invoice template editor. The "Studio" app (which allows no-code template editing) is available only in Odoo Enterprise. That’s why you’re not finding a straightforward option online for Community.

Use QWeb reports already available

• Odoo comes with a default invoice template. You can duplicate and modify it, but this normally requires XML editing (coding).

External tools / modules

• On Odoo Apps Store, some free modules allow a bit of template customization in Community Edition (like adding logos, headers, or small layout tweaks through settings).

Without coding at all

• The only built-in option you have is adjusting:
  
  
• • Company logo & details (via Settings → Companies).
    
    
  • Paper format, header/footer (via Settings → General Settings → Document Layout).
    
    
  • Payment terms, footnotes, and extra text fields (via Invoicing → Configuration → Settings or on the customer invoice form itself).

Hi.

Are you looking for a print template or adding a new template for invoice print out or for a pre defined template from which you can create a new invoice record ?

If the later is the case means, such an option is not there by default, in sales there is quotation templates, from which user can create new records using this template.

if you need the same, you have to customize and make it possible or just create a draft invoice and name it as Template and duplicate/copy this while you need to create a new invoice.

If the question is about a print template, you can add new template from code.

Reference:  https://www.youtube.com/watch?v=pIevsbkoq-E

Thanks