Set DHCP to static for PC in Base-IP
After importing CSV the DHCP type reflects as Regular to change the values to DHCP Static.
Select the Edit properties by going to -> Expert -> Set advanced properties
In the following windows select
Property : Add a DHCP static
Inheritance property : Set
Value : yes
Click on the button ADD
The advanced properties list will be filled automatically
Validate the settings for all the selected items.