Set the repository as it was on an earlier commit

Hi,

Firstly merry Christmas everyone.

I am somewhat new to git, and I've found great, but still I have some doubts about it, let's say I have the following repo with:

A---B---C---D

Being A the first commit,  B the second one an D the last one.

How I do to go back to let's say... B commit status, I mean somewhat as follows:

A---B---C---D---B'

B' would be the same as B. I am not asking to do something so:

A---B---C---D to A---B losing C and D commits,

I'd like to keep on history C and D commits, can git to do that?

Thanks in advance!