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# Define User Calculations

1. In the Define Geology > Models tab, click the User calculations tab.
2. In the User calculations data grid, click Insert.

A first row is added to the data grid.

3. In the new row, type a name for the calculation, and define the expression for the calculation.
4. To create rows for other user calculations:
   - Repeat steps one and two.
   - In the User calculations data grid, click in the row you want to copy, and then click Create copy.

   A new row is added beneath the existing rows. The new row has the same Expression, but Name is the Name of the copied row with _1 appended. If you have copied the row previously, and <Name>_1 exists in the data grid, the name for the new row appends the next incremental unused integer. For example, if MINING_COST_1 and MINING_COST_2 exist, the new row has the Name MINING_COST_3.

   - In the User calculations data grid, right-click in the row you want to copy, to display the shortcut menu, and click Copy.

   A new row is added beneath the existing rows. The new row has the same Expression, but Name is the Name of the copied row with _1 appended. If you have copied the row previously, and <Name>_1 exists in the data grid, the name for the new row appends the next incremental unused integer. For example, if MINING_COST_1 and MINING_COST_2 exist, the new row has the Name MINING_COST_3.

   - In the User calculations data grid, click the field at the last column of the last row, and then press TAB.

   A new row is added beneath the existing rows. The new row is blank, except the Name field. The default name given to the new user calculation is calc_1. If you have already added a blank row, which has the name calc_1, the next row added increments the number by one, so that the new row has the name calc_2.

### See also

- Calculate Net Present Value - Example
- User Calculations Data Grid

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