Hitman 3's progress carry over system allows players to bring all the in-game unlocks they've made in Hitman 1 and 2 into the new game. It also lets them import levels from the old games into the new one.
Hitman 3 Progress Carry Over: How to Carry Over Levels
The process for importing levels varies depending on platform and game format. Levels and progression can only be carried over from within the same platform, so a PlayStation version of Hitman 2 is required to carry progress into Hitman 3 for PlayStation, for example.
Each game or expansion in IO Interactive's Hitman series has a corresponding DLC called an Access Pass. If you already own the previous games and expansions, you should be able to download the Access Passes for free.
Although Hitman 1 content can be migrated to Hitman 3, it must be done so through Hitman 2. Begin by importing your levels and unlocks into Hitman 2. That will unlock the Legacy Edition in Hitman 2, in turn unlocking Legacy Edition for Hitman 3. If you already own the Legacy Edition of Hitman 1 and haven't purchased the Game of the Year Legacy Edition, you'll automatically receive an upgrade to GOTY Legacy Edition in Hitman 3.
If you're importing levels from Hitman 2 via a digital copy of the game, the Access Pass should be immediately available in Hitman 3. If you're importing via disc, you'll have to redeem the Access Pass in Hitman 2 before it's available in Hitman 3. Xbox users might also need to own a digital version of Hitman 3 or the Hitman 2 Free Starter Pack before the Access Pass can be redeemed.
Hitman 2 Gold Edition and the Hitman 2 expansion should work the same way.
Hitman 3 Progress Carry Over: Unlocks, Experience, and More
In addition to levels, players can bring their profile rank, location mastery experience, unlocks, challenge progress and Elusive Target suits from Hitman 2 into Hitman 3. To do so, they'll need to head to the official Hitman website, log into their IO account and follow the instructions they provide.
This transfer can only be done a single time, and IO recommends players do it before they start playing Hitman 3 — any progress made in Hitman 3 will be overwritten by imported progress from Hitman 2.
The IOI website