Tommy
I have mocked this up to see if I can see what you are seeing
1) How do you get to the Correct Number for Select Fill being 4074.8 cy
a) I see that the Select Fill in the Pad AOI is 1099.8 but that is for the AOI ALL - if you want this for each Pad you need to create AOIs for each pad and then the report will look more like this
In My example it looked like this (Pad 1 was left and Pad 3 was right and Pad 2 in middle
So Pad 3 was the only one which had some additional Fill to get to OG (I did not strip soils etc.). So the Fill Number in Pad 3 AOI is the extra Select Fill needed right?
Then for the Select Materials in the Pads the report looks like this
For each Pad (100'x100') it gives the same numbers for Concrete (6" Thick) and Select Fill (18" Thick)
If for each Pad I add the Embankment Fill and the Select Fill together I get the right number (I believe anyway).
In your example because you have the ALL AOI (and of course I dont know what that is specifically) you have the number of 1099.8 of embankment fill plus the Select Fill in the Purchased Material Report of 2175 cy which when added together give you 3274.8 yet you say the number should be 4074.8 (I don't see where that number comes from (can you explain where you get that one from)
Are you saying that the issue is that the Math is wrong or that the fact that one part of the volume is reported as Earthworks (Earthen Material) that doesn't have a Cost, and the other is Earthen Select and that does have a cost and that because you cannot specify the "Type of Fill" to be used (Only the Native Material (which you can set to an Earthen Material of the same name as a Select Material) (I used Select Fill II for the Fill beneath the Select Fill I in the Site Improvement Area)
So is the problem really that you want to be able to Define a "Filler" in the Site Improvement so that if applied to a pad that after the Concrete and Select Fill is applied the base is hanging over the OG surface requiring More Fill that you could specify the Fill needed in the Site Improvement using a Select Fill (Earthen Select) (maybe with a Maximum Depth Value) that would be computed without using the Native Soils as the fill - and that way you would have the correct quantity of Select Fill in the Purchased Materials and the Correct Cost?
I can see that would be handy in this scenario where you need to apply a Filler at the base of Select Fill in Fill Secnarios like this. Apologies but this is not possible to day at least. I have tagged this request as an Enhancement Request for consideration by development
Alan