Can add to PIE from Cash in ISA?

Just wondering, I have an ISA with cash always sitting. Can I use this cash to transfer or fund an auto-invest PIE. Or do I need to transfer this cash to my bank account and then auto-invest from my Bank into my PIE?

When funding a pie manually the funds come from the free funds of your T212 account.

Thanks for that info but to clarify, So I cant use this sitting cash in my T212 account to auto invest in my PIE I can only use it for manual investing to my PIE?

Yes, currently you can’t auto invest with the cash in your account. We will add that option soon.