You need a couple more formulas and a shared variable.
Since you want the sum of these values, not the last one as you are probably getting, what I would do is modify your Jet Fuel formula to something like:
shared numbervar totalJetFuel;
local numbervar thisJet;
if {CPARTY.CODE} = "CHAS GP" then thisJet := -34.1 else
if {CPARTY.CODE} = "MSLN" then thisJet := -28.1 else
if {CPARTY.CODE} = "GSIL GP" then thisJet := -46.1 else
if {CPARTY.CODE} = "BARC GP" then thisJet := -4.6 else
if {CPARTY.CODE} = "CALY GP" then thisJet := -1.6 else
if {CPARTY.CODE} = "SCBL" then thisJet := -1.5 else
if {CPARTY.CODE} = "BNPA GP" then thisJet := -0.9 else
totalJetFuel := totalJetFuel + thisJet
thisJet
this will display the same amount as before, but will add tot he running total as it goes.
where you want to display the total(in the footer) the formula looks like:
shared numbervar totalJetFuel
in the header for the group (probably) you would want to set the total to 0 otherwise you just keep adding and your number make no sense, and that formula would look like:
shared numbervar totalJetFuel := 0;
"" //I place the double quotes to suppress a 0 floating on the report for now reason.
Hope this helped.