See below image.
In the % column I need total % for each of the 3 categories for Days (Project,RFC,Support) for that particular month.
For example:
for the first service under ‘Project’ in April i would need (9.4/(9.4 + 0 + 1.8)) * 100
for the first service under ‘RFC’ in April i would need (0/(9.4 + 0 + 1.8)) * 100
for the first service under ‘Support’ in April i would need (1.8(/9.4 + 0 + 1.8)) * 100
This would give me total percentages for each category on days per month.
What is the expression i need to use in the ‘expression’ box in design view to cover all my services?
Second image (above) is the Expression I have tried to use but am getting #ERROR on all records

=Fields!Days.Value/Sum(Fields!Days.Value, “Date_month_name”)