Yes, as per the link @DougGreen shared, you can use the Analysis tool Dissolve Boundaries to create multipart polygons based on features with shared attributes.
Note that as with all analysis tools, you'll need the required user types and privileges in order to be able to perform analysis. This functionality is currently only available in Map Viewer Classic, but will be available in Map Viewer soon.
If you want others to be able to perform this analysis, you could consider creating a Web App, using Web AppBuilder. Go to Contents > Create App > Web AppBuilder
Within your web app, you can add the Analysis widget, and then choose the Dissolve Boundaries tool.
Then you can select your data of interest as the input features, choose to dissolve based on fields with the same value, and then ensure that Create multipart features is checked on.
Amanda
Product Engineer - Web Analysis