To view information about Class B VFR Transition Routes that are noted on a Terminal Area Chart, go to DOCUMENTS > FAA > VISUAL CHART SUPPLEMENTAL and download the appropriate TAC Supplemental for the area in question. Once downloaded and open, swipe right to left to find the description for the Transition Route in question.
Here is an example. In Nevada, near McCarran International (KLAS), there is a note to the west of the airport concerning the Rocks Graphic for a VFR Transition Route.
Image 1. Terminal Area Chart showing a box referencing the VFR Transition Route - Rocks Graphic.
To find information on this particular VFR Arrival Route, go to the Documents page and tap on FAA in the left column and then Visual Chart Supplemental in the right column. Tap on the Las Vegas TAC Supplemental. Once downloaded, open the Las Vegas TAC Supplemental and swipe from right to left to find the Rocks Route graphic.
Image 2. Las Vegas TAC Supplemental showing the Rocks Route graphic.