I can not figure out how to do multiple exits from one signal

["Bengtsson, Mats" <mats.bengtsson@xxxxxxxxxxxx>]

Guess it is possible? 

What I would like to do is to buy say for example 200 shares at one point,
and every time a certain condition is true sell one of those shares. 

I can not figure out how to do it. Selling one share is not the problem,
getting my signal to sell until number of shares is zero is the problem.

What am I missing?

--- Mats ---
Cap Gemini Sverige AB
European company of the year 1999