What does this mean?

May be...

when i was looking at the MGS4 walk through the thing said this ( Inheritence

You carry over your Drebin points, weapons, ammunition, items, and special items from a previous game upon game clear. However, Snake will need to encounter Metal Gear II in the first stage to get his stuff back.



Be sure to save your cleared data upon game completion to track your items. Load the cleared data to reap your benefits.



what does it mean and how do you really get it your old stuff back to your new game file? thank you very much

After you beat the game and see the credits, you will have the option to save your game.



If you save your game, then load that save from the main menu, it will start a new game.



Since you are back at the start, once you meet up with the Mk.II like you did the first time, you get all your weapons and equipment back, along with your face camouflage and any other items you've unlocked (like secret items such as Stealth and Bandana, or the Solar Gun) and when you meet up with Drebin all your points are restored from the previous play.