Selecting Columns in the Planning Table 
You can select sections of the planning table for further processing. For example, you might select a section of the planning table and change its period split in order to plan in greater detail; or you might decide to run the forecast for a limited section of the planning horizon.
- Selecting individual period splits
To select a period split, double-click on that column or position the cursor on its heading, and choose Edit → Select → Select periods.
- Selecting a block
To select a block, select the first and the last period split in the block.
- Selecting all period splits starting from a specific column
To select all periods starting from a specific column, position the cursor on the period heading in that column and choose Edit → Select → Select from column.
- Deselecting all periods
To deselect all periods, choose Edit → Select → Deselect periods.
- Deselecting all period splits starting from a specific column
To deselect all periods starting from a specific column, position the cursor on the period heading in that column and choose Edit → Select → Deselect from column.