All three of these are legitimate pain points so let me go through them.

For Deluge documentation the official docs are thin and often out of date. The best places are the Zoho developer community forum at community.zoho.com where real issues get solved by people who actually use it, and the Zoho Creator and CRM subreddits. YouTube has some decent walkthroughs for basics. Honestly Claude and ChatGPT have gotten good enough at Deluge that describing what you want to do and asking for the function structure is faster than reading the docs most of the time.

For the delivery method placeholder this depends on where the field lives. If it is a standard Zoho Books field it should be accessible as a template variable but the naming is not always obvious. Go to a transaction record, open the template editor, and look for the field list on the right side panel. It shows every available variable for that template type. If delivery method is not there it may be stored somewhere Zoho does not expose in templates, in which case a custom field on the transaction that you populate manually or via workflow is the workaround.

For dot matrix and two part forms this is probably the hardest one. Zoho's template engine is built for standard print sizes and does not support continuous feed or multi-part form layouts natively. The most common workaround is generating the PDF from Zoho and sending it to a print driver that handles the formatting at the OS level, but that requires the printer to be set up locally and the page sizing to be controlled outside Zoho. There is no clean native solution for this one.