| Name | Description | |
|---|---|---|
 | Add | Adds a new column or range of columns. |
| AddRange | Internal use only. |
| AddRangeGroup | Groups all the columns from the specified start index by the specified amount to an outline (range group). |
| Clear | Internal use only. |
| ExpandRangeGroup | Expands or collapses a specified outline (range group) of columns. |
| Get | Overloaded. Gets the specified column. |
| GetRangeGroupInfo | Gets the outlines (range groups) by level. |
| Remove | Removes a column or range of columns. |
| RemoveRangeGroup | Removes columns from the outline (range group) starting from the specified index and count, and returns them to individual columns. |