hi HowYee,
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps4324/product_data_sheet0900aecd8035cf2b.html
according to that document, it is not possible if you want to put supIV to 4006 chassis
Chassis and Line-Card Support
You can deploy the supervisor engine IV in single-chassis nonredundant mode in the Cisco Catalyst 4503, 4503-E, 4506, and 4506-E chassis. You can also deploy it in single-chassis redundant mode as an option in the Cisco Catalyst 4507R chassis (slots 1 and 2 only) and Cisco Catalyst 4507R-E/4507R+E chassis (slots 3 and 4).
The supervisor engine IV is compatible with the classic Cisco Catalyst 4500 and the E-series Cisco Catalyst 4500 Line Cards. Table 1 gives performance information for the Cisco Catalyst 4500 Series Supervisor Engine IV.
regards,