I have a shipment weight calculator sheet.,

There is a list of products,I fill in  the quantity of  each product that 
is going in a particular shipment.
The sheet then adds up the products weighst and gives me a combined weight.
All of the above works well.
-----------------------------------------
I want to add this feature: Updating of stock level for each item based on 
each shipment, but ONLY when I click on an update button.

Example, some times I just want to see how much a package will weigh but 
not update the stock levels, so I fill in the quantities of for each 
product going in the package, it then shows me the total weight.
              BUT, I only want it to subtract (UPDATE) the stock levels 
based on the shipment contents IF I click on an "update" button (or enter a 
1 into the triggering cell).

What is the best/easiest way to do this?:

idea 1)  I can insert an image than when I click on it it performs a script 
to run a formula in the stock level cell(s)
           Anyone have a link for how to script something similar.  I know 
how to have an a script run when an image is clicked on, but don't know how 
to cause it to have a formula run in a cell only when the image is clicked.

idea 2) Is there a way to conditionally cause a cell to run it's formula 
only when a certain value is entered into a cell. i.e the "trigger/button" 
cell has a 1 in it versus a zero. The simple "conditional format" menu does 
not have an option for this.

Thanks for any advice,links etc.






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