For instance putting =B2 into cell D2 will copy the current value of B2 into D2 and it will update as B2 changes.
If you are talking about a small set of cells, like 10 or less, then you can just do that with simple formulas. Instead, use formulas to take the current value of one cell and place it in another. If the numbers in the first table change, you would have to repeat the copy and paste. There’s no way to copy and paste like that.