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To achieve what you are after will require use of SQL as I don't believe you will achieve it just through SSRS alone.<br />
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this seems related to <a href="https://www.experts-exchange.com/questions/28175022/SQL-2008-Reporting-Services.html" rel="ugc">Q_28175022</a> and I still recommend use of row_number() to assist in this; see <a href="https://www.experts-exchange.com/questions/28175022/SQL-2008-Reporting-Services.html?anchorAnswerId=39298948#a39298948" rel="ugc">ID: 39298948</a><br />
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The very best way to move this (and the other Q) forward quickly and accurately would be to provide the table definitions and some sample data from each. Also provide expected results and if you have an existing query also supply that.<br />
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although this may sound like wanting too much - truly, quality answers are most quickly provided by sample data and expected results.
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To achieve what you are after will require use of SQL as I don't believe you will achieve it just through SSRS alone.

this seems related to Q_28175022 [https://www.experts-exchange.com/questions/28175022/SQL-2008-Reporting-Services.html] and I still recommend use of row_number() to assist in this; see ID: 39298948 [https://www.experts-exchange.com/questions/28175022/SQL-2008-Reporting-Services.html?anchorAnswerId=39298948#a39298948]

The very best way to move this (and the other Q) forward quickly and accurately would be to provide the table definitions and some sample data from each. Also provide expected results and if you have an existing query also supply that.

although this may sound like wanting too much - truly, quality answers are most quickly provided by sample data and expected results.

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I have a report that is grouped by a vendor code. &nbsp;I then have the trailer number in the header for grouping and a couple of totals. &nbsp;One of them shows a time in and because it is located in the group header it shows only the first time in, I wanted this to happen for each trailer number. &nbsp;In the details I have a formula where I take the time out and subtract it from the first(time in) and that works for the first grouping. &nbsp;I want it to pick up the time in for the next group instead it is using the first one of the whole table in stead by each group. &nbsp;How can I set that up?
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I have a report that is grouped by a vendor code.  I then have the trailer number in the header for grouping and a couple of totals.  One of them shows a time in and because it is located in the group header it shows only the first time in, I wanted this to happen for each trailer number.  In the details I have a formula where I take the time out and subtract it from the first(time in) and that works for the first grouping.  I want it to pick up the time in for the next group instead it is using the first one of the whole table in stead by each group.  How can I set that up?

SQL 2008 Reporting Services

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.

Microsoft SQL Server

Microsoft SQL Server 2008 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. Major improvements include the  Always On technologies and support for unstructured data types.

Microsoft SQL Server 2008

SQL Server Reporting Services (SSRS) is a server-based report generation software system from Microsoft. It can prepare and deliver a variety of interactive and printed reports and is administered via a web interface or its web service. Its web services interface also supports the development of custom reporting applications. Finally, SSRS can also be integrated with SharePoint. SSRS competes with other business intelligence tools, most prominently Crystal Reports.