Adding Multiple VLANs/Variables to a Configuration Template

I am searching for a way to add a drop down menu within the SolarWinds NCM client that will enable me to choose from a drop down list of predetermined VLANs that one may choose from when defining the variables and running the script. I understand how to make a template that will allow me the choice of entering a VLAN string, however, I would like the choice of adding multiple VLAN options to my configuration template. Any help in this regard would be greatly appreciated. Thanks in advance!