Many website update changes

I’m doing a wordpress site and using gitlab ce for versioning and interacting with my dev. Love gitlab ce btw.

I want to post changes from the client in either issues or to-do. Then enter a ‘/estimate’ value after each change estimating how long it should take the frontend guy to make the change.

Atm I’m opening an issue and adding many ‘/estimate’ values after each change. Doesn’t seem to be the way to do it. Can’t seem to segment changes by time estimate value.

So I guess I can either open a new issue for each change or perhaps use a todo list ?

When the dev uses a ‘/spend’ to record time spent. Where is the best interface to view spend vs estimate values ?

Sorry for the newbie question …