Hi @Leslie_Strickland and welcome to the Forum!
As it stands, this is not possible. You can create your own Portfolio and share it with your executive team or add them as Portfolio Members so they can have access to it.
We have a thread on the #productfeedback category: Only want to upgrade specific users to a business plan. Feel free to add you vote and comment to it.
Please let me know if you have any follow-up questions! Have a great day!