Why won't photoshop allow me to merge my channels together?

Question

I have about 7 channels that need merging together so I can save the file as a JPEG, any ideas?

Answer 1

I've been able to merge my spot channels into the RGB channel which is not exactly what i wanted
I'm not sure what you want because the above could mean more than one thing and I don't know the book and the tutorial you are following.
My guess is fill all composite channels with white before merging. To do this, make sure the composite RGB channel is selected, press the d key to set the background color to white, select all (Ctrl + A) and fill (Ctrl + Delete)
If you are talking about deleting the actual RGB channels from the Channels panel, this is only possible using Image > Mode > Mulitichannel which converts composite channels to C, M, and Y and then you can delete them but I doubt this is what you want. Multichanel mode can not be saved as jpg and converting back to composite mode will merge as composite any channel be it spot or alpha in the order they are sorted in the Channels panel for the corresponding channels in the converted mode. For example if you convert to RGB you need 3 channels, the top one will be used for R, the next one for G, and the bottom one for B. For CMYK you need four channels. Obviously this conversion will alter the appearance of the original spot channels unless they really represent composite channels like R, G, and B.