Cumulative Running total - sum

Question

I have a query below that i want to have a running total on the cumulativesum column. currently it shows just the total for the period i am after.
complexity i have is the hour of day is different against one day to the next. example below is 03-23(hr of day) for 28, then 00-02(hr of day) for 29.
mdx for refer
with
member [measures].[Cumulativesum] as sum ({
{[Hour Of Day].[Hour].&[4]:[Hour Of Day].[Hour].&[24]}*{[Date].[Fiscal Months].[Date].&[20220828]},
{[Hour Of Day].[Hour].&[1]:[Hour Of Day].[Hour].&[3]}*{[Date].[Fiscal Months].[Date].&[20220829]}
}, [Measures].[Cartons Picked])
select
{
[Measures].[Cartons Picked],
[measures].[Cumulativesum]
}
on 0,
{
{[Hour Of Day].[Hour].&[4]:[Hour Of Day].[Hour].&[24]}*{[Date].[Fiscal Months].[Date].&[20220828]}
,
{[Hour Of Day].[Hour].&[1]:[Hour Of Day].[Hour].&[3]}*{[Date].[Fiscal Months].[Date].&[20220829]}
} [enter image description here][1]
a view of the output
running total using .currentmember but need it in one column and only for the hours i need.
i've broken the above to parts to solve one step at a time, one problem i have come apon is the ranking bit, see below. any help on solving the rank much appriciated.
with
set daterange1 as {[Date].[Fiscal Months].[Date].&[20220828]}
set daterange2 as {[Date].[Fiscal Months].[Date].&[20220828].nextmember}
set hrs1 as {[Hour Of Day].[Hour].&[4]:[Hour Of Day].[Hour].&[24]}
set hrs2 as {[Hour Of Day].[Hour].&[1]:[Hour Of Day].[Hour].&[3]}
set Datehrs as nonempty({{hrs1}*{daterange1},{hrs2}*{daterange2}}
,[Measures].[Cartons Picked])
member [Measures].[rank] as rank(([Hour Of Day].[Hour].currentmember,[Date].[Fiscal Months].[Date].currentmember), Datehrs)
select
{
[Measures].[Cartons Picked]
,
[Measures].[rank]
}
on 0,
datehrs on 1
Cartons Picked rank
03 28-Aug-2022 1802 #Error
04 28-Aug-2022 3587 #Error
05 28-Aug-2022 6333 #Error
06 28-Aug-2022 7711 #Error
07 28-Aug-2022 5707 #Error
08 28-Aug-2022 7923 #Error
09 28-Aug-2022 6502 #Error
10 28-Aug-2022 5100 #Error
11 28-Aug-2022 7656 #Error
12 28-Aug-2022 5067 #Error
13 28-Aug-2022 5505 #Error
14 28-Aug-2022 8914 #Error
15 28-Aug-2022 10050 #Error