Hello,
I have a task that needs to be extended by adding additional IP addresses.
Several scans have already been executed for this task, and currently OpenVAS does not allow modifying the target list once scans have been performed.
Is there any workaround for this limitation?
From an operational perspective, it does not seem practical that IP addresses cannot be added to or removed from a task that is already in use.
Best regards,
It is not a limitation, if´s by design to have a audit proof and not moving target. You can always clone the task and add an IP as long no results are there.
From a compliance point of view, you just don´t want to have a moving target where the Admin can add or remove IPs as he likes 
You have the option to make the task editable when you create it.
If you want to change the target IP range, add an IP/host, exclude an IP/host you just have to create a new target and swap out the target selected for the task. You cannot edit targets, but you can swap them out on editable tasks.
Is the the “workaround” you are looking for? 
Thank you!
