Hi Neb,
Unfortunately
PSP doesn't have anything equal to the Channel Layers tab that Photoshop has. However, you can view the individual color channels by using the Image/Split Channels... menu (first attachment). I've used this in the past to work on the channels separately, then combine them back together.
In addition to the Color Balance dialog Craig mentions, there is also the Color Mixer adjustment which is almost exactly like the one found in Photoshop. This allows you to control the percentage for each of the color channels separately.
You can right-click promoted layers in your Layers palette, then choose Properties... The Blend Ranges tab supports color channel selection as well.
Not nearly as interactive as Photoshop's Channel Layers tab.
Hope this helps.
- Kurt