Exclude area of section within the outline for volume calculation

Hi everyone, i have aquery if you could help me with, it might be obvious that i am missing it. I am looking to calculate the volume of tarmac on a road construction ( i have as built survey of Existing and Proposed ) where the road have an island which is soft landscaping. How do i select (or exclude) the outline of the road where it is only going to be tarmacked. Thanks

I found what I was looking in the tutorial videos, the way t do it select an area within area of outline that will be excluded.

I found what I was looking in the tutorial videos, the way t do it select an area within area of outline that will be excluded.

Hi Mick. Sorry we missed your post on Friday. For anyone else who wants the precise location, here's a link: https://youtu.be/HiTVcWfJI3E?t=645