To assign tasks to multiple users:
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Add a Person field to your form. Set Selection Type to Multiple and Style to Checkboxes.

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Select the correct source form under Look Up People From.

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Include the right people by setting appropriate conditions.

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Save your form.
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Go into the Workflow section and edit the role that you would like to assign multiple users to. In the drop-down menu under Share With, select the Person field you just created, then click Save.

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Save your form, then go to your Entries.
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Create a new Task View assigned to the Accounting role.

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Under the Filter option, select Shared With Current User to only show entries shared with the Accounting role in the appropriate entry status (ex: Approved).

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Hit Apply and then save your changes to this view.
Learn more about Workflow Tasks.