Add checkbox in node menu settings
If I understand you correct, you want a menu to appear only at a certain content type? It is not done from there.

In Drupal 8 each menu is a block; After you have created the menu regularly with the native API unchanged, just add the block to the desired region and then set that block to appear only in a certain region you want it to appear in (You should see such an option in the block's conf page).