Pay Over Time question

I have a CSR (for now…) and cannot for the life of me seem to understand the pay over time plans, even after reading a bunch of threads about it.

I am the sort of person who pays down the balance a couple times a month when it gets bigger than my completely arbitrary comfort level.

If I make a purchase, say $1000, and put it on pay over time, will I continue to be able to pay my other balance as normal a few times a month or will the “interest-saving” option interfere?