The following formulas are used to calculate change values for Portfolios. $VPC stands for Value of Position Change.
If position still open:
(Last * Total Shares * $VPC) - (Close * Quantity *$VPC).
If position closed (exit price entered):
(Exit Price * Total Shares * $VPC) - (Close * Quantity $VPC)
(Today's Change / (Close * Quantity * $VPC))*100