How to create style(s) or classe in order to write a dictionary with 2 languages, one LTR and the other RTL ?

[Dom Meg]

Hi,
I am brand new to Lyx and I try to evaluate the best tool to make a 
french-persian dictionnary. So I am looking for some help creating the style(s) 
in order to get something like :
Abrasif /abʁazif/ adj. & n.                          (۱) ساینده، پاک کننده
 (۲) آلت خراش؛ ماده ساینده

My biggest problem is the switch between a LTR language to a RTL one.

For information, I have posted the same question in french to lyx-fr, …

Thanks in advance,

Dominique