The following formula relates to one worksheet. I now want to dupicate this
formuala so that it now relates to 12 worksheets all throwing to one cell,
the only change is the sheet ref. Is there an easy way to do this other than
copy and cut / paste changes

=(SUMPRODUCT(--('Angus Waygu SF 120 day'!$E$29:'Angus Waygu SF 120
day'!$E$84='Cattle Budget'!D7),--(('Angus Waygu SF 120
day'!$B$29:$B$84='Angus Waygu SF 120 day'!$B$9)+('Angus Waygu SF 120
day'!$B$29:$B$84='Angus Waygu SF 120 day'!$B$18)),('Angus Waygu SF 120
day'!$C$29:'Angus Waygu SF 120 day'!$C$84)*'Feedlot Assumptions'!$B$3))