TT Premier purchased from Costco is a software installation in laptop. I would like to know 2 things
1. Can I use the Costco license code somewhere online if I continue to filing my return directly on the TT Website
2. If I want to use the laptop installed version, is there anyway to bring the already entered data online into that installed version in my laptop?
1. No, you cannot
2. Yes, you can. See this TurboTax support FAQ for how to download the tax data file from the online editions to your computer - https://ttlc.intuit.com/community/saving/help/how-do-i-save-my-turbotax-online-return-as-a-tax-data-file/00/25740
No you cannot use the CD/download online. The license code cannot be used to pay for online software. Online and the CD/download are different platforms--you cannot move back and forth. When you use the CD/download your tax files are only stored on your own hard drive or any backup device you use like a flashdrive. They are not stored online and you cannot access it online.
Going back and forth between two PC's or laptops etc would be clumsy--you would have to save it to a device and move the files every time you change computers.