The odds are given by the betting companies ready, both for the final result and for the halftime / final, as well as for all the other points. What you should be interested in is to learn to calculate for yourself what the odds are for each point you want, so that you can see if the companies' returns match the odds you have calculated. If you learn to calculate the odds of points, the odds they have to offer are the easiest. However, if you have gotten to the point of calculating the odds of a final result, what you need for a half / final is a good database with HT \ FT statistics. With such a database, you will calculate the percentage scatter of the halves on the final result, ie for example what percentage of aces has an ace, X, or double, at halftime.
I will give you roughly a general average for the dispersion, to have an overview of the halves in the end. Beyond that, prices fluctuate slightly depending on location. In order not to confuse you again, these values refer to the scattering of the halves on the final results and not the chances of the half / finals per se. If you have the chances of the final results, you calculate the dispersion accordingly.
_1 / 1______X / 1_____2/1
59,7% ___ 34,8% ___ 5,6%
_1 / X______X / X_____2 / X
19,4% ___ 62,4% ___ 18,1%
_1/2_____X/2_____2/2
6,8% ___ 37,7% ___ 55,5%