Composite charts

[nimrod]

First post - brand new to Esignal so apologies if this is elementary.

I need to produce a number of composite charts along the following lines and haven't a clue where to begin with what I have got (ie ESignal Premier):

Subtract (or add or divide) one instrument series from(to/by) another, correct for currency differences and plot the results. For example to plot the relative performances of FTSE100 and SPX in Sterling terms.

Thanks in advance for any pointers

[ACM]

nimrod
For instructions on how to create spreads, ratios etc see this article in the eSignal KnowledgeBase
Alex