Start with the eur/usd chart, place the inversion indicator, right click on the chart and use the overlay option or insert symbol option and place usd/chf. After this you should be able to highlight and drag the usd/chf chart into the window with the inverted indicator.
If this doesn't work, simply use the chf/jpy and eur/jpy. It is the chf and euro correlation you are seeking anyway with the eur/usd and usd/chf.
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I Think i could use this...