Modifying Huge ACL & prefix- list ?

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Probably, there are multiple way to achieve your goal.
Here is one of simple way that I knew and used in my work. (using vi editor)

For example, you have IP blocks below. Current prefix list name = Hello

1. Create new file with vi editor = from prompt "vi acl" (on unix or linux)
2. Copy and paste entire list of new IP blocks into the new file just created
3. To add "ip prefix-list Hello permit" in front of raw IP blocks, follow below step

Now, you will see the below

4. To add "le 32" or any option, follow below steps

5. Using the blow commands, complete modifying entire IP blocks.

Final IP blocks look like below

It is help only huge huge huge list of access list or prefix list.
After modifed raw IP list, add it to current access list or prefix