I don't know how to print both values on the same label. I looked at all the available parameters in the SKM label designer and did not see that I could choose line and load. You can calculate both values and print them on separate labels. I do not recommend this for switchboard construction though as the switchboard probably doesn't have adequate barriers to prevent a line side fireball from traveling downstream into the poor guy working on the customer meter on the load side of the main breaker at the top of that section or even into the next switchboard section. Here's how to print separate labels though if you still want to do that.
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0 MSB ONE-LINE.jpg [ 168.51 KiB | Viewed 551766 times ]
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1 SETUP.jpg [ 288.96 KiB | Viewed 551766 times ]
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2 PRINT.jpg [ 332.99 KiB | Viewed 551766 times ]
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3 LABEL.jpg [ 333.14 KiB | Viewed 551766 times ]
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4 SWITCHBOARD.jpg [ 386.06 KiB | Viewed 551766 times ]