So, I want to create this % variance between bar as the screen:
Is it possible? If not, any suggestions?
Thanks in advance.
No, you can't do in OBIEE exactly what you have there. However, you can do something similar with a waterfall chart (see image below from Sample App).
Personally, I prefer the waterfall display than the one you're trying to do. Worst case scenario, you can present those results in a table.