Question How check which button for same action

Hi,

I have a Build action who change my current action map from "Player" to "Build".

When it changes, I would like make a an action into "Build (Action Map)" with multiple input keys.
Buildings prefabs should have a string with letter of his shortcut. For example, when user presses "B" (Build) and then "P" it should build "Palace".

How should I do? I wouldn't like make an action for everyone Building, just Bindings.

I hope it's clear my question.

 

To people who could have same question:

Code (CSharp):

1. int nBuildActions = _input.Build.BuildAction.controls.Count;
2. for (int i = 0; i < nBuildActions; i++)
3. {
4.     InputControl control = _input.Build.BuildAction.controls;
5.     if (control.IsPressed())
6.     {
7.         control.name; // this is the name of action. IE: "F [Keyboard]" would be "f"
8.         break;
9.     }
10. }