ssrs hiding group

by sections are you meaning, 3 columns of data or what?
you should be able to hide duplicates of a given column by setting the property value to the name of the group
SSRS2005TextboxProperties.png

I want to hide all rows for a certain group.

not seeing what you are trying to do yet.  Maybe more details or pictures would help?

I have an ssrs reports that has 3 groups - sfw, hdw, no app. within those 3 groups the sfw and hdw will have duplicate rows so i dont want to hide anything. in the 3rd group i have the below example of data- some rows are duplicates and i want to hide all detail rows only in the no app group that have duplicates. i cant hide duplicates in whoe report

servera  12
servera  12
servb    1
servc  1
servt  12
servt  12

try putting something like this in the Row>Visibility>Hidden property.
That is the only way I can think of to do that for only one subset of records.

=IIF(Fields!yourGroupField.Value="3rdGroupValue" and Fields!yourField1.Value=Previous(Fields!yourField1.Value),True,False)

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i am getting the definition is not valid that the hidden expression for table refers to table1_group2 . reprot expressions can only refer to fields within current data set scope, if inside an aggreate, the specified data set scope. do i need to change something?

your are going to have to share more details, I do not know exactly what you put in your expression or how table1_group2 relates to it.  table1_group2 sounds like a GroupName or something.  When I used Fields!yourGroupField.Value="3rdGroupValue",  I was refering to the field value that makes up the 3 groups you mentioned: sfw, hdw, no app.

Thanks for the help with this.

Thanks guys.