Trendline to ignore empty cells

[Kara]

I am working on an Excel spreadsheet that contains 5 sheets of graphs and 5
or 6 sheets of data. I am trying to not show the trendline when a cell is
empty. I have found a couple of threads about this but do not quite
understand them and would appreciate your help!

Most of them refer to the NA() function but I am not sure where to enter
that and have it reflect in my chart.

I have an average price sheet that contains my total sales for each week and
some of those cells are empty. What would I enter into those empty cells so
they will not show on the trendline in my chart?

Thanks for your help!

 

[Bernard Liengme]

IN the sales column cells, in place of blanks cells type =NA()
This is display as #N/A
The chart will extrapolate the values for 'empty' data
best wishes

 

[Kara]

This still shows the trendline although the trendline is not at zero. Is
their a way for the trendline to not show at all in that area of the chart?

Thanks for your help!