How to make a default rotation of an object?

Hi, I imported an *.obj doors from Sketchup, and I then realized that the doors were by accident not following the axis but instead were rotated for few degrees on Y axis. When I corrected it to position I wanted, I had rotation for that object (0,3.7,0)

What I want to achieve is to make this position and rotation of my object default one, I want it to make its rotation equal to (0,0,0) while keeping the current position of obj in the world. How can this be done?
Thanks

 

Make an empty game object, then add the door to it. Rotate the door (not the empty!) to the right spot. Make a prefab of the empty and use it for your doors.

 

I tweaked it in sketchup again. And I already tried what you said but it didn't do because I used PivotManager.js script from unity wiki scripts that turned out to not work well and there was some bugs after using Center Pivot. But thanks anyway