Stored Procedures - Use dynamic cursor for any table - response (3) by elvicio

Can you post the code. 
I have a table (items) with two columns etc. column A, Column B
A             B
item1     23
item2    24
I have another table (itemline) 
item1     item2
 
I am looking to update (itemline) based on items table like this:
item1    item2   item3
23         24        100
 
can you please help.  I am trying to do a crosstab based on my first populated table.