Hi @Kamel_el ,
May I ask if you want something like this? When 'Keyword' appears in [Column1], [Index] + 1.
If so, please refer to the solution in this thread.
Solved: Index column only for specific value
If I have misunderstood your needs, please feel free to contact us.
Community Support Team
If there is any post helps, then please consider Accept it as the solution to help the other members find it more quickly. If I misunderstand your needs or you still have problems on it, please feel free to let us know. Thanks a lot!
How to get your questions answered quickly -- How to provide sample data