I have made a newer build which I want to add for submition and review but can not delete the build 7 like I used to before with the red negative button at the end. why is that and how to delete it to add the new build.

after doing all the steps as in The app version submission must be in the “Prepare for Submission” state There must be at least one IAP/subscription in the “Ready to Submit” state All banking & agreements must set up and in place I am still not seeing the In-App purchase and subscription in my iOS App Version page to add to my newest version slash build