Creating one trendline for multiple series

[ALaw]

Hi,
I have a document withfour different series and these are all plotted onto
one curve. I want a trendline that fits all four series of data onto one
trendline.

I don't want to create a new series with all of the data and then fit a
trendline to that. Is there any way I can just fit one to all four sets of
data?

Thanks

 

[Jon Peltier]

I don't want to create a new series with all of the data and then fit a

trendline to that. Is there any way I can just fit one to all four sets of
data?

Unfortunately this is how it has to be done.

- Jon