INDESISN Place Another InDesign
Importing other InDesign documents
With a document open, choose File→ Place or use the keyboard shortcut Ctrl+D (Windows) or ⌘ +D (Mac). ...
Select the Show Import Options checkbox at the bottom of the Place dialog box. ...
Navigate to an InDesign file and double-click to open it. ...
Click OK.
Click the page to place the document.