Within the Cashflow section of your Plenty dashboard, you can now add tags to transactions. In addition to four default tags (For Review, Needs, Reviewed, Wants) you can create custom tags as you see fit. These tags can be used to apply filters to the Cashflow view.

Custom tags can be created by clicking the settings wheel and selecting "Tags"

These tags can then be filtered as desired by toggling them in or out of the Cashflow view.