<div>
in case you want to dynamically populate the result without using formula, you probably can try use pivot table as well<br />
<a href="https://filedb.experts-exchange.com/incoming/2015/07_w29/923613/28697646.xlsx" target="_blank" class="file-inline" title="pivot table (11 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>28697646.xlsx</a>
</div>


in case you want to dynamically populate the result without using formula, you probably can try use pivot table as well
28697646.xlsx [https://filedb.experts-exchange.com/incoming/2015/07_w29/923613/28697646.xlsx]

28697646.xlsx

<div>
I think in this case much more handy is to use Pivot table rather than formulas.<br />
Just select table, go to Insert&gt;Pivot table and put Class into Rows and Weight (sum) into Values. If you change your source table just right click on Pivot table and click Refresh.<br />
See attached sample.<br />
<a href="https://filedb.experts-exchange.com/incoming/2015/07_w29/923614/sample.xlsx" target="_blank" class="file-inline" title="sample (11 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>sample.xlsx</a>
</div>


I think in this case much more handy is to use Pivot table rather than formulas.
Just select table, go to Insert>Pivot table and put Class into Rows and Weight (sum) into Values. If you change your source table just right click on Pivot table and click Refresh.
See attached sample.
sample.xlsx [https://filedb.experts-exchange.com/incoming/2015/07_w29/923614/sample.xlsx]

sample.xlsx

<div>
<div class="content wysiwyg-content">
Hi Experts,<br />
I have a spreadsheet with a weight column and class column in section 1.<br />
In section 2, I want to list all the classes in section 1, but I want to group all the like classes and sum the weights of the like classes.<br />
How can I do that with a formula? &nbsp;I really don't want to use VBA, if I could possibly I would rather use a formula. &nbsp;How can I accomplish this?<br />
<br />
I have included an image below to help explain what it is I wish to accomplish.<br />
<a href="https://filedb.experts-exchange.com/incoming/2015/07_w29/923610/Excel-sample.JPG" target="_blank" title="Excel-sample.JPG (62 KB)"><img alt="Excel-sample.JPG" class="file-block lazyload" style="max-width: 594px;" data-src="https://filedb.experts-exchange.com/incoming/2015/07_w29/923610/Excel-sample.JPG" /></a><br />
Thank you very much in advance,<br />
mrotor
</div>
</div>


Excel-sample.JPG

Hi Experts,
I have a spreadsheet with a weight column and class column in section 1.
In section 2, I want to list all the classes in section 1, but I want to group all the like classes and sum the weights of the like classes.
How can I do that with a formula?  I really don't want to use VBA, if I could possibly I would rather use a formula.  How can I accomplish this?

I have included an image below to help explain what it is I wish to accomplish.


Thank you very much in advance,
mrotor

I need help with a grouping formula in EXCEL

Microsoft Excel topics include formulas, formatting, VBA macros and user-defined functions, and everything else related to the spreadsheet user interface, including error messages.

Microsoft Excel

Microsoft applications include a variety of software programs, including development and digital authoring programs (Expression and Media Center), educational programs, Internet software, including Essentials, Skype and the Live family, anti-virus, productivity applications and suites like Office, Excel, Word, Outlook, Access and PowerPoint, video games and server applications such as Exchange, SharePoint, IIS and Virtual Server.

Microsoft Applications

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

Visual Basic for Applications (VBA) enables building user-defined functions (UDFs), automating processes and accessing Windows API and other low-level functionality through dynamic-link libraries (DLLs). VBA is closely related to Visual Basic and uses the Visual Basic Runtime Library, but it can normally only run code within a host application rather than as a standalone program. It can, however, be used to control one application from another via OLE Automation. VBA is built into most Microsoft Office applications.