It is possible to create different price batches for your ticket. To do so, go to the right side, press the blue button and then click on EDIT.
A box will open on the right side. Scrow down to the bottom and find the section Price Batch.
Click on +ADD BATCH.
Add the value and the date you would like to start selling this batch.
To add another batch, click on +ADD BATCH.
When done, press END to save the data.
Your invitees, when filling in the registration form, will be able to purchase the tickets. The price displayed will be the one relevant to the purchase date.