Unlink between git branches

Question

Say you have a git branch named branch A, and you created a new branch, derived from a branch named branch B.

Is it possible with a series of commands (rebase?) To have branch A be removed from branch B? If so, how will this affect other branches already received from branch A? How to influence the history of fixing branches?

To set the context of a question:

I have an intermediate branch (B) and a branch from which I get task branches from (A). I see that every time I pull a request from A to B, when I compare B from A to GitHub, the changes that I just pull into B appear as differences. To fix this, I need to locally merge A to B (which does not change any files) in order to get a comparison of the two so that they appear as having no differences. I want to change their relationship to fix this.

Feel free to answer this question in a way that simply solves the problem mentioned here.

Visual:

I have:

   *(Feature Branches)
  /
 /
A (Developing Branch)
 \
  \
   B (Staging Branch)

I want to:

B (Staging Branch)
 \
  \
   A (Developing Branch)
    \
     \
      * (Feature Branches)

Answer 1

, , . , , .

o < develop
|
o < staging
|
o < v0.2
|
o < v0.1

o < develop  < staging
|
o 
|
o < v0.2
|
o < v0.1

,

git checkout staging
git rebase develop
git push origin staging