AutoInvest will deposit funds and then automatically invest them into your pie. It's up to you 'how much' and 'how often' you want to AutoInvest.
You can choose to enable AutoInvest for a pie while you are creating it.
You can also turn on/off the AutoInvest option for any pie at any time, by going to the AutoInvest section of that pie:
How is the newly contributed money allocated? 🤑
AutoInvest buys shares based on your pie's targets. For instance, if £100 are deposited into a pie of 5 slices each having a target of 20%, £20 pounds will go towards each slice.