To add an Advice Reason (AR) to an Advice Option AO, click the view advice reasons link corresponding to the AO you wish to add the AR to. 

As an example, let's assume I want to add an Advice Reason (AR) to the Mortgage Repayment Advice Option (AO) in the Other Solutions step of the Investment Recommendation section.

On clicking view advice reasons the table will refresh and display the ARs for that the Mortgage Repayment AO, like this.

To add your AR, click add advice reason. You will be directed to a new page where you will be prompted to include your custom advice reason and save it. All advice reasons added by you will be coloured green.