Adding a Multi-Select Combo Box in Acumatica

By | September 11, 2025
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If you’ve worked with Acumatica, you know the standard dropdown only lets you pick one item. But what if you need to choose several? In real projects, that’s common—and that’s where a multi-select combo box can make life easier.

Let’s take the Project screen (PM301000) as an example. Say you want to tag your projects with labels like “Internal,” “Billable,” or “Urgent.” A single-select dropdown just won’t do the job if a project can fall under more than one category.

That’s where a multi-select combo box comes in. Users can add as many tags as needed to a project without having to dig through menus or change any settings.

Step 1:

Open the Customization Screen (SM204505).

Click on the “Add” button, add the project name, click on “Save,” and publish the project.

Example:

As an example, we will use the Project screen to demonstrate how to add a multi-select combo box.

  1. Open the Customization Project.
  2. In the customized screens section, click the “+” icon to add a new screen (In my example it is Project).
  3. Open panel where you want to add new field.
  4. Then, select a field and use “Create New Field” command to create a new field.
  5. go to Data Access classes and select you class and field.
  6. add PXStringList in the field
    [PXStringList(new string[] { “I”, “B”, “U”}, 
    new string[] { “Internal”, “Billable”, “Urgent” }, MultiSelect = true)]
    there is one additional parameter “MultiSelect = true” that advises
    Acumatica to store multiple values in this field.
  7. Publish this customization project. 

Step 2

1. Use the “Create Controls” button to create a field. Use drag and drop to adjust field position. Please make sure that your field is of type “ComboBox.”

2. Set the multiselect property to TRUE on the user interface control. 

Click on the OK and then publish the project.

The Project screen now includes a Project Tags section, where you can select more than one tag for better categorization.

Conclusion:

Allowing a multiselect option for a dropdown field would help businesses to manage their work more fluently rather than adding a new field for the same thing, which is already available. It’s a straightforward process, and you can put it to use immediately.

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