I would like to upgrade my current iPad with one that I want to buy online. If I buy it online will I still be able to do the upgrade in a VZW store"
Yes. This is exactly what I did. Got the iPad Air 2 Verizon LTE. The iPad comes with the Apple SIM, which Verizon is not participating. I took the iPad to the Verizon corporate store, got a free Verizon SIM and the iPad activated on my account.
To answer the question correctly, we need to know which ipad you are buying.
I'm planning on buying the iPad Air 2 with Wifi + VZW 4GLTE.
