Chetan Sachdev - 2017-02-11

I want to print multiple documents but need output as one single PDF. I am using macOS and managed to install PDFwriter. I am able to print PDF but can't find any option, where I can specify Append the print to last PDF. Could someone please point me on how can I achieve this.
I am looking for a dialog box, which should appear when I click on Print option or that setting should be available in the Print dialog box.

Note: I know that I can manually merge multiple PDFs using Preview or many other tools.