Recovering specific folders from Time Machine backup and restoring to an external drive.

I have purchased a new iMac with a smaller SSD than my previous iMac. When I restored the data from the previous system to the new one I had to leave out huge folders with photos and videos in them in order to fit the rest of the stuff on the drive. The backup restored well.

I purchased a large external drive in which to keep the large amounts of data left out of the restoration due to size restrictions.

How can I restore that Time Machine backup onto the new external drive so I can recover the specific data left out of the restoration to the new iMac SSD?

or alternatively how can I recover specific folders from my Time Machine backup and place them wherever needed?