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Narrowband colour combination is easy in PI... Invoke the LRGBCombine process with the narrowband images as the R, G & B (untick L.) Use SII for R, Ha for G and OIII for B if you want Hubble palette. The little round global apply button at the bottom left of the process is the one you have to click on.
A screen stretch (Ctrl-A) will now show you what you have in your colour image. It will probably be very green because the Ha is usually brightest. Bring up the STF process and untick the little chain icon at top left then select your image and type "Ctrl-A" again to do an unlinked stretch. That will show you a result with more balanced colour.
Cheers,
Rick.
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