I'm building a holiday expense planner and I'm trying to get the sum of a column in a table, however as I pay things off I want to be able to strikethrough the amount and then it minus it from the total sum.
Is this possible with Numbers?
I'm not sure you could necesserily do it with a strikethrough but another approach would be to use different formats for positive and negative numbers where the neggative doesn;t show up. The various accounting formats often include on where the negative doesn;t show up but the number appears red when it is a negative.
I haven't used Numbers but I would say "Probably not."
Spreadsheets don't generally expose their presentation layer (font styles, colors, etc.) readily to their calculation layer (cell formulas and inbuilt functions).
A common approach to your task is to use another column to store a status for each payment (Due, Paid, etc.) and then to use a conditional summation function to correctly sum the total. The Excel function is SUMIF and I'd expect Numbers to have something similar.