Standard costing - cost roll ups & revaluing

Good morning (from a NEW Netsuite user),

I am seeking some help regarding standard costing, and more specifically processing a cost roll up and revlauation of these items.

Scenario
Inventory item A costs £20
Inventory item B costs £10
Inventory item C costs £5

Assembly item G consists of one item A and one item B, therefore costs £30
Assembly item H consists of one item B and one item C, therefore costs £15

I have updated the standard costs on the item set up screen for the three inventory items, and have then set up a standard cost version.

When I complete the standard cost roll up (LISTS-ACCOUNTING-STANDARD COST ROLL UP) I choose the relevant standard cost version and tick the "update inventory cost" box.