From information on the Perspecta and DXC web sites this is a simple spinoff for DXC shareholders.
Use the Spinoff transaction in the accounting software.

• Date the spinoff 5/31/2018.
• Parent company is DXC Technology (DXC)
• Shares of Perspecta (PRSP) received = (# DXC shares owned x .5). Include any fractional shares
• Choose the option < Remaining Basis percentage> Enter 87.06 in this field.
• Use 24.50 as the price of PRSP on the spinoff date.
• If your broker statement shows cash-in-lieu received, enter this amount in the cash received field of the Spinoff transaction.