Although you can assign individual videos to your subscriptions, you can also save time by distributing your content in bulk to each subscription.
After uploading and organizing your videos, navigate to Content > Videos to begin assigning them
If you have a lot of content, your videos may be paginated, so within each page, select the videos you want to assign to your subscription by checking the box next to the video thumbnail
Click on Add to plans, which is below the search bar
Select the subscription you want the content assigned to and click Save
Keep in mind that this selection does not remove subscriptions from unchecked plans, it only assigns the videos to the selected Subscriptions.