RockWorks allows you to create cross-section and profile diagrams of a variety of types of data – such as modeled lithology, stratigraphy, aquifer, geochemical or geophysical data, fractures, etc. It can be very helpful to layer these profiles to determine, for example, the spatial relationship between a contaminant hotspot and the stratigraphic layers, or your water levels and the lithologic environment.
I’ll describe here an easy way to pop one profile onto another – in this example overlaying a benzene profile on top of a stratigraphy profile.
1. Create your two profile diagrams using the same annotation settings and the same profile slice. This assures that the profile panels will have the same coordinate range. I find it helpful to arrange the two profile windows on my screen, one above the other, so that they are both accessible.

Arrange both profiles on your screen so they're both visible.
2. With the RockPlot Edit Arrow tool activated, click on the I-Data profile contours to select them. (Note the red selection handles in the panel corners in the upper image.) Type Ctrl+C to copy this layer into memory.

Click on the I-Data profile color contours to select that layer, and copy it to the clipboard.
3. Click in the Stratigraphy profile window and type Ctrl+V to paste the I-Data profile into this diagram.

Paste the I-Data panel onto the Stratigraphy profile
4. Double-click on the I-Data layer you just pasted into the combined diagram to adjust the minimum contour level and transparency, so that the stratigraphic layers will be visible in the background.

Adjust the minimum contour level and/or transparency.
5. Click OK to close the Colorfill Attributes window.

Now you can see the stratigraphic profile in the background.
6. If you like, you can copy /paste the I-Data color legend in to the combined diagram. Use your mouse to resize/rearrange the legends as desired.

Combined Stratigraphy and Benzene Profiles