Hi Swapnil,
You can create "Tax Code" in access sequence from t code M/03 as mentioned by Mukthar Ali Ahamed N
After entering the T code give any table name as "111,222 etc and hit enter and it will take you to the next screen where you will find Tax Code in Field Catlg just double click on tax code and it will come on the left side of the screen(Screen Shot Attached),save it.
Now you need to assign the condition type through FV11 but do choose tax code when asked in key combination.
Hope this will work.
Regards
Eugene