Spreadsheets can very soon become limiting. It is always better to use a full fledged portfolio tracker. You should check out Cointracking Portfolio Manager.

It has

1. Automatic import of trades through APIs.
2. Average purchase and sale price reports.
3. Booked and unbooked profits.
4. Ability to calculate your taxes.
5. Set up price notifications.

For details of how to use these features checkout this post.