First things first , if you have a build with state Pending Developer Release for version (ex: 1.0.0) you cannot upload a new build with same version (ie 1.0.0)
Or Else if you want to upload a new build with same version 1.0.0 you should cancel already approved build for version (ie 1.0.0) which changes the state of the build to Developer Rejected , in this state you can upload new build ( with probable bug fixes ) on same version (1.0.0)
If for some reason apple rejects your new build ( They inform why they rejected though), you cannot go back to already approved build.
Now if you want to release the build and make it Read for sale state then it's visibility in Appstore depends on Availability in Countries.
If you make Availability to none , then the build state for version 1.0.0 changes to Developer Removed From Sale ( No need to panic , if you add one or more countries in Availability the state would change to Read for sale state again)
However this makes you restricted from using 1.0.0 version again , so you need to use 1.0.1 or any new version greater than previous one.
If versioning is not an issue , you can release 1.0.0 and remove countries , so even if newer build (1.0.1) is rejected by apple , you can still release your app on the pre-decided date.
Hope this is helpful information.
Thank you very much for that answer! Couldn't get any better! I was going to try, but I was wondering about the ASO if I put the countries to none! But now I'm going to do that! Thank you again so much! It's really a precious help!
@ViktorJovanovic Glad it helped :)