The fields overview tab provides information about the fields and available acres in a plan. It includes several common elements, including a data table, bulk updates and a year selector:

Many parts of SnapPlus V3 store data on a year-specific basis. That is because data describing the fields, crops or applications on a plan may change from year to year. When data is limited to a particular year it follows these rules (every time):
Copy field will create an exact copy of that field including all of the data. This means soil tests, map geometries, crops, applications. More information on copying fields is available on the copy field dedicated wiki page.
Fields can be set to inactive on a annual basis as described above. For example if a field is inactive in 2025 and active in 2026, this will cause the field to not show up in reports generated for 2025, but still show up in reports generated for 2026.
The ownership or agreed-upon use of fields on a plan will vary. Entering this data will allow reports to autogenerate a list of fields that are rented, owned, or have a spreading agreement. You may keep data about fields that were rented or had spreading agreements in the past by setting them to inactive. This will exclude them from your plan and reports in years they are set to inactive, but preserve the field data in your plan if needed later.
Field groups and subfarms are helpful tools for nutrient management planning. They can be used to organize data geographically or by physical characteristics, and come in handy when generating reports. The important difference between a subfarm and a group is that a field can only be in one subfarm, but can be in any number of groups.
Group and subfarm creation, modification and filtering are available on the Overview tab and the land attributes tab. Advanced group building options are available in the Group Builder tab.
Clicking the gear and then clicking the create new button will turn the dropdown menu into an input box and give some instructions:

A name is required. The group will not be saved automatically like a nutrient system or template. Fields can be selected directly from the data table. Filters can be applied before selecting fields. All displayed fields can be added to a group or subfarm by clicking Add all fields to group (or subfarm).
Once the group is created, the filter will be applied to the table and only the fields in the newly created group or subfarm will display.
The edit button will allow you to change a group name. On clicking Edit, all fields will display in the table, and the current members of the group or subfarm will be highlighted:

Select and remove fields from the group or subfarm, change the name to something more fitting and click the check button when you are done. Clicking the X will undo any changes and return the group or subfarm to its original state.
You can do this by clicking delete.