Hi @LennartWalldén ,
Does your original table looks like this?

Do you want a table that looks like this?

Could you tell me the data type of the fields in original table?
I assume that except projectname field, others are all number type.
If so, try this formula to create this kind of collection:
ClearCollect(yearlybudget,
{Year:Year(Today()),
Totalproj:Sum(Filter('Project Management',Year1=Year(Today())),BudgetYear1)+
Sum(Filter('Project Management',Year2=Year(Today())),BudgetYear2)+
Sum(Filter('Project Management',Year3=Year(Today())),BudgetYear3)+
Sum(Filter('Project Management',Year4=Year(Today())),BudgetYear4)+
Sum(Filter('Project Management',Year5=Year(Today())),BudgetYear5)},
{Year:Year(Today())+1,
Totalproj:Sum(Filter('Project Management',Year1=Year(Today())+1),BudgetYear1)+
Sum(Filter('Project Management',Year2=Year(Today())+1),BudgetYear2)+
Sum(Filter('Project Management',Year3=Year(Today())+1),BudgetYear3)+
Sum(Filter('Project Management',Year4=Year(Today())+1),BudgetYear4)+
Sum(Filter('Project Management',Year5=Year(Today())+1),BudgetYear5)},
{Year:Year(Today())+2,
Totalproj:Sum(Filter('Project Management',Year1=Year(Today())+2),BudgetYear1)+
Sum(Filter('Project Management',Year2=Year(Today())+2),BudgetYear2)+
Sum(Filter('Project Management',Year3=Year(Today())+2),BudgetYear3)+
Sum(Filter('Project Management',Year4=Year(Today())+2),BudgetYear4)+
Sum(Filter('Project Management',Year5=Year(Today())+2),BudgetYear5)},
{Year:Year(Today())+3,
Totalproj:Sum(Filter('Project Management',Year1=Year(Today())+3),BudgetYear1)+
Sum(Filter('Project Management',Year2=Year(Today())+3),BudgetYear2)+
Sum(Filter('Project Management',Year3=Year(Today())+3),BudgetYear3)+
Sum(Filter('Project Management',Year4=Year(Today())+3),BudgetYear4)+
Sum(Filter('Project Management',Year5=Year(Today())+3),BudgetYear5)},
{Year:Year(Today())+4,
Totalproj:Sum(Filter('Project Management',Year1=Year(Today())+4),BudgetYear1)+
Sum(Filter('Project Management',Year2=Year(Today())+4),BudgetYear2)+
Sum(Filter('Project Management',Year3=Year(Today())+4),BudgetYear3)+
Sum(Filter('Project Management',Year4=Year(Today())+4),BudgetYear4)+
Sum(Filter('Project Management',Year5=Year(Today())+4),BudgetYear5)}
)
Best regards,