Is there a way to sum totals based on multiple matches?  Say in the following
example, from a separate sheet, i want to sum up the totals for stationary on
the first sheet.

e.g.

Expense Type    Total
stationary           £15
car                     £140
instruments         £150
stationary           £25

...so I want to return the 15+25 based on a lookup (assume lookup value to
be a given/stated i.e. "stationary").  Range will be constant size and named
e.g. "JanExpenses"

N.b. there will be 12 sheets, each with similar lists (1 for each month)
which i would then need to sum, so the above might just be for January.  I
would then want to add this to Feb-Dec returned totals

thanks