Videomaker – Learn video production and editing, camera reviews › Forums › Specialty Topics › Special Effects › Add additional video. › well it depends on your
well it depends on your software
you must have the ability to add an additional 'timeline' or 'pip' (picture in picture)
it's really obvious when you have multiple time lines so I'm guessing you don't.
You also didn't give possible responders much to work with…
as in, what software you are using.