Ok I finally signed up but someone explain to a barely functional drunk stoner how to get my google drive doc to magically do this for me.
Ok, it's not quite magically easy, but here's what you do:
This should probably be done from a computer, as I'm not quite sure how to do this with a mobile device.
A) Create a new Cellar in CellarTracker
A1. Open CellarTracker
A2. From the "My Cellars" page, Create a new cellar.
A3. From the "My Cellars" page, click the Import button for that cellar
A4. Leave this page open, so you can get back here for reference
B) Prepare your google spreadsheet
B1. Open your google spreadsheet.
B2. Make sure the very first row of your spreadsheet has keywords that match the Columns in the "CSV File Format" box on the CellarTracker import page. For example, you should probably have at least a "Brewery" column, and a "Name" column.
C) Export your google spreadsheet.
C1. From the pull down menus in the spreadsheet, click File->Download as->Comma-separated values (.csv, current sheet)
C2. Save the file to your hard drive, and keep track of where you put it.
D) Import your file into CellarTracker
D1. Back on the CellarTracker Import page, click the "Browse..." button, and then select that file you just exported.
D2. Click the "Upload" button.
If everything went well, you should see some results come back that tells you how many rows were updated, and if there were any errors.
Edit: I'm adding this as a FAQ in the application, and I'd appreciate suggestions on how to make this process easier/more clear.