Create a time function in the Time function definition dialog, and then select the Points tab to define the points of the time function. 
To define the points of a time function manually
- Enter the value of the time point in seconds in the T box. 
 
- Enter the dimensionless value of the function in the F(T) box. 
 
- Click Add. 
 
The points are added in the table. 
 
To define the points of a time function using a mathematical formula
- Click Add expression. 
 
- Enter a mathematical expression. 
 
- Specify the Beginning, End, and Time step values. 
 
- Specify the angle unit. 
 
- Click OK. 
 
The points are added in the table. 
 
To delete a point of the time function
- Select the point that you want to delete in the table. 
 
- Click Delete. 
 
Note: 
- To delete all the points of the function, click Delete all. 
 
- To delete points of a time span, click Delete Span and define the time span to be deleted. 
 
 
 
To modify a point of a time function
- Select the point that you want to modify in the table. 
 
- Modify the values of the point in the T and F(T) boxes. 
 
- Click Modify. 
 
 
To import a saved definition text file
- Click Read. 
 
- Navigate to the location of the file, select it, and then click Open.