Expenses Set Up - Use of 'In Totals' and 'In Details' flags

Can I ask the forum exactly what the effect of the two ticks 'In Totals' and 'In Details' has on each of the Expense lines in Webtools

I assume that they have the same effect on each Expense heading but could be wrong.

I am concerned that the flexibility of the set up here, especially as it can involve tax, could mean errors or un-predictable results unless the effect of these flags is clearly understood.