Hi,

I need to know how can I make a sum with checkboxes

Example:

Containers: caxu125414, quanity of pairs: 220

Containers: chjcu25455, quanity of pairs: 5620

And next to the quanity cell, I've a checkbox (True or False)

Now, how and which formula can I use to make a sum, when the ckeckbox
is at TRUE?