If you would like to set up a pool of hostnames in C2, you can navigate to Admin -> Resource Pools -> create. To upload a set of values, instead of inputting them one by one, you can create a CSV file with the values.
To create a column with a lot of these values easily, in a Google spreadsheet or Excel you can paste a formula like this into many rows:
="winhost-" & ROW() + 30
Make sure to include "hostname" as the topmost value in the column.
We will be adding the ability to specify ranges in the UI before long, but this should be a useful workaround until then.