You can modify a pattern of drilled holes if you created a pattern feature for the holes. To learn how to create a pattern, see
Add a drilled hole.
To change a pattern of drilled holes,
1. Click Part Library and then, in the Drill group, click the arrow next to Modify.
2. Select the type of pattern you want to change in the Hole Pattern section.
3. Select the Pattern in the Structure Browser.
4. The fixed position is indicated by a red arrow in the viewport. If you want to change this, click Fix Drill and select a hole feature in the viewport or Structure Browser.
5. The current values are displayed for reference. Change the values in the New values section.
◦ Where you see a + or -, you can change the number of connections before (+) or after (-) the connection defined as the fixed position.
◦ When you modify a linear grid, direction 1 is indicated by the green arrow and direction 2 is indicated by the cyan arrow in the viewport.
Modify.
to complete the operation.