This is a good example of understanding how it is important to understand how the underlying parachain may have different use cases for the token and therefore if you want to query the "total""portfolio" balance of an asset for an account requires that you either take it as verbatim - the balance of the asset in the tokens pallet is the total"portfolio" balance for that assestasset for that account OR understand, from a high-level, what is considered as the total"portfolio" balance (see example image below) OR that you have your own definition of what you consider to be the total"portfolio" balance for an asset for an account and for that requires an understanding of how the tokenasset is stored and how it can be used within the parachain's ecosystem.