How to add tick boxes

This is just my second post and I am quite new to Excel. I have already learnt a great deal from this site but I am ashamed to say that I don't understand a lot of the terminology so please bare with me with my 'basic' questions.

I would like to know how to add tick boxes that can be checked / unchecked to alter a formula?

Eg. If I have a list of figures and a total from those figures, would it be possible for me to turn certain lines in the list on and off to alter the total figure?

Many thanks
Daniel

That's great cheers.

The spreadsheet example download doesn't appear to work though, I don't suppose you have a copy that you could send me do you?

Thanks very much for that.

Would you avoid simply due to it being time consuming?

To apply it to my spreadsheet could be very complicated.