Duplicating a sheet and keeping cell link to another sheet?

If I have 2 tabs open in google sheets. One is monthly budget, the other is savings. I have cells from monthly budget linked to savings cells to add amounts. If I duplicate the monthly budget tab (for a new month). How do I go about keeping the link continuous no matter how many times I duplicate budget and every duplicate just adds another reference to the current savings cell I’m trying to modify.

Sorry if it’s confusing