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Generally, 4500 support 6, 24 or 48 Gbps per slot. Specifics depend on chassis, supervisor and line card.
Some line cards group certain ports for bandwidth to the fabric; this is usually noted on the data sheets for the line cards. For example the WS-X4418-GB:
● 2 ports of wire-speed 1000BASE-X Gigabit Ethernet uplinks
● 16 ports: 4:1 oversubscribed
Your 4648 and 4448, ports aren't noted as being grouped. I.e. all their ports appear to share the 24 and 6 Gbps, respectively.
Yes, you can use supervisor ports as you wish. Do note, when using two supervisors, by default, only two 10g ports, per sup, are enabled by default. You can enable all the ports (with over subscription).
