how to merge one document into another document LibreOffice6.3

I want to merge text documents into another document to have one file. I am having trouble getting specific instructions to do the merging. I have LibreOffice 6.3.

Open your file where you want to merge.

Move the cursor to the desired position in the document.

From the menu, choose Insert> Paste Text From File....

In the Insert dialog box, select the desired file and click Open.

You can do this any number of times.