In a waterfall strategy, essentially you set up the releases with each single building up to an EP/album release. There are quite a few artists doing waterfall strategies these days. Each release is a standalone product, so you need to upload each new single with the previous singles re-uploaded on the tracklist, and using the same ISRC for each previous single on the new product
eg.
Release 1
1. Single #1
Release 2
1. Single #2
2. Single #1
Release 3
1. Single #3
2. Single #2
3. Single #1
And you keep the same ISRC for Single #1 / Single #2 across all releases.
Then you can takedown the previous releases each time a new one comes out.
You can see an example of this on LEISURE’s release ‘Side A’ you will see in their ‘singles & EPs’ tab they had each release (Slipping Away, Spark It Up, Lonely Nights) building up to the final product.