Dataset Column Filter Within an Expression

I have a shared dataset called "CommAccessEnrollments." Within the dataset there is a column called "On_Net_Off_Net" that will output a value of either "On Net" or "Off Net." Within the same report I have a row of
just On Net results and another row with just Off Net results. I made 2 different datasets (from the same shared "CommAccessEnrollments" dataset) with filters on "On_Net_Off_Net" for On Net and Off Net results ("CommAccessEnrollmentsOnNet"
and "CommAccessEnrollmentsOffNet"). Instead of having to create two different datasets to derive the on net/off net information, can I define that within the expression?
Here is my existing expression for On Net: =Sum(Fields!M4.Value, "CommAccessEnrollmentOnNet") 
Here is my existing expression for On Net: =Sum(Fields!M4.Value, "CommAccessEnrollmentOffNet") 
Would something like =Sum((Fields!M4.Value, "CommAccessEnrollment") WHERE On_Net_Off_Net = On Net) work?
EDIT:
This expression also does not work:
=Sum(IIF((Fields!ON_NET_OFF_NET.Value, "CommAccessInstallsAll") = "On Net", Sum(Fields!M4.Value, "CommAccessInstallsAll"), 0))

Hi Pamela,
According to your description, you want to sum M4 values of "On Net" and "Off Net". Right?
In this scenario, since you have set the filter for the whole the dataset to filter the records where it is "On Net" or "Off Net". We can create a parameter to filter the records instead of creating two datasets. Specify "On Net" and "Off Net" as Available
Values and set the column equals the parameter. Now you just sum the M4 value and the scope should be the whole dataset. If you want to combine the records of "On Net" and "Off Net", you can set row group on "On_Net_Off_Net" and add Total for each group instance.
For your last expression, the reason why it's not working because we can't specify scope for a data field directly, so "(Fields!On_Net_Off_Net.Value,"CommAccessInstallsAll")" is invalid.
Reference:
Report Parameters (Report Builder and Report Designer)
If you have any question, please feel free to ask.
Best Regards,
Simon Hou 

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