You can reset the TPMS to stop it from tripping if you've reduced pressure in your tires, but there's a catch: If you drop the pressure too low, you can reset the TPMS so that it doesn't complain about the low pressure, but the tires will heat up too much as you drive, and the pressure will rise significantly. When it does that, the TPMS will tell you that your pressures must have been too low because now they've gone up too much.
What counts as "too low" will vary depending on your load at the time. An empty van can take a much lower pressure than a fully laden one. The only way you'll be able to find out is by playing around with the pressures yourself. As a starting point, I was running 45 front, 55 rear with a nearly empty van (if I remember correctly). No TPMS issues until I picked up a pallet of stuff. Then, the TPMS kicked in after I'd been driving on the freeway for a while and the rear tire pressure was up to ~63.