Method that sets a custom line type to the entity from the specified .lin file. The method automatically changes the value of the LineType property to kCustomLineType.
| Name | Type | Description |
| FullFileName | String | The full path and file name of the .lin file. |
| LineTypeName | String | The linetype name specified in the .lin file. |
| ReplaceExisting | Boolean | Indicates whether to override an existing line type of the same name. |