With Sc csv export tool, you can export stock associated to products as well as associated to combinations in a single file.
In the mapping panel, the column called 'Options2' includes various options allowing you to decide whether you want to export product or combination information.
To export stock associated to products AND combinations, then add 2 'quantity' fields and associate them to both options, like so:
You'll find two other options in this column: 'Default behavior' and 'Product Value if combination value is empty'
if the option 'export combination' is ticked => we export the stock of combinations
if the option 'export combination' is not ticked => we export the stock of products