How to get cumulative decreasing values by substracting from the previous row.... in a dynamic added

Question

I have pdf table like this:-
Header 1
Header 2
Header 3
Header 4
Header 5
Header 6
Header 7
From
To
No. of Days
Balance
Date
1
2
<ADD Button> / <Del Button>
3
4
5
This
Row
is
730
to
be
hidden
DateFieldFrom
DateFieldTo
DateFieldTo-DateFieldFrom(Some No1.)
Remaining1=uppervalue(730)-Some No1.
Now when i click the <add  rows button>  rows are to be added and i have to get the valuesof Remaining2(Remaining1- Some No.2 )in the Added Balance Row
how will i do this?

Answer 1

Hi Luis,
According to your description, you have a report with different dynamic columns. Now what you want is show your user percentage growth in your matrix report after your user select two of those columns (I think you may use parameter to achieve your “checkbox”
function). Is my understanding correct?
In Reporting Service, we can’t calculate dynamic columns with our build-in arrogation functions. So we need to add custom code into our report, and call those functions which defined in custom code in our expression. We have tested your scenario in our local
environment. Here are steps and screenshots for your reference.
Go to your Report Properties, add the custom code below into your report:
Dim Shared Num1 As Double
Dim shared Num2 As Double
Public Function GetCalification(Calification as Double,Type as String,Type2 as String) 
If Type = Type2 Then
   Num1=Calification
Else
   Num2=Calification
End If 
Return Calification 
End Function
Public Function GetPec()
Return (Num2-Num1)/Num1
End function
Create a matrix. Put PilarName into Row field, put Period into Column field. In Data field, put the expression below into the textbox:
=Code.GetCalification(Fields!Calification.Value,Fields!Period.Value,Parameters!Period.Value(0))
In our sample report, we created a parameter (named Period) for selecting two columns. You can replace “Parameters!Period.Value(0)” with your own parameter.
Add an outside column at right (%Growth), put the expression below into the textbox:
=Code.GetPec()
Save and preview. The matrix and result looks like below:
Reference:
Custom Code and Assembly References in Expressions in Report Designer (SSRS)
If you have any question, please feel free to ask.
Best Regards,
Simon Hou