>I have 4 milion rows in this table (I counted the dbf but the memo with content in all rows).
>60% of the rows - 11 length.
>20% 12-32
>19.95% 33-58
>0.05% - 67
>
>I want to svae space.
>

>if its les 100 mb
>	its not worth
>else&&(more)
>	its importent
>endif

>
>I need help with the set blocksize syntax.

You must create a brand new table in order to use a new blocksize. The blocksize in effect when a new table is created, stays fixed for this new table.

Set blocksize to 50
Use oldtable
copy to newtable 
use
copy file newtable.* to oldtable.*
use oldtable exclusive
Index on.. && To recreate the index tags.