HI, 

Many thanks for this post. 
I Have a question ? 
What do you modify in Autolisp if I want to change the value of incrementation ? 

The value of incrementation is a answer of a question ? 

Exemple : 
I select many blocks. 
I execute BL_NUMBER
And I had 2 questions : 
Start Number ?  my answer "1"
Offset Number ? My answer "2"
My result is :
First 1
Second 3
three 5
etc...

Many Thanks at all 

Vince `