It's easy, you have two options!
Option No. 1: Set a future sales date
When you publish your book on our platform, you can set the sales date to a day in the future. You'll see this feature in the form below when you publish a book:
"Publication" is the day that the book will be visible and available to buy from the store.
"Start sale" is the day the book will actually be released.
The period in between these two dates is therefore the pre-sale period. People will thus be able to order your book during this time, but will only receive it on the sale date.
Option No. 2: Create a book page before publication
Your second option is to set up your book page before your eBook is ready for publication. This allows you to start promoting it beforehand and allows your readers to pre-order. However, this can only be done in some stores.
To do so, in the PUBLISH app, go to Management>Books and choose the option "pre-sales". You'll see the usual book form to enter all the metadata and manage all the publication's settings. The only difference is that you don't need the ebook file to put the page online!
Your book will be available for pre-order on Amazon, Google Play, Apple and Kobo. You can set up a book page before providing the file up to 9 months in advance. You should provide the file (once ready) at least one week before the release date to make sure it's processed by all the stores in time.
NB: unlike other stores that manage pre-orders (i.e Amazon or Apple), Google wants the file to be uploaded as soon as possible. It often doesn't show the book without it. Here are the instructions they give to the distribution platforms:
"Due to variable processing times and other factors, Google cannot guarantee that a book will be available for pre-order sales during a specific time range. We recommend that you send us your book as soon as you are able."