To find a 4-channel oscilloscope in Multisim 11.0, users must have the 'pro power' suite, as the 'base' or 'full' suites only support 2-channel oscilloscopes. There is no formal way to add a 4-channel oscilloscope in the lower-tier suites. For those needing multiple waveforms quickly, alternatives like PSpice or LTSpice IV are recommended, with LTSpice being free and capable of displaying numerous waveforms. Users can refer to National Instruments for a comparison of the different Multisim suites. Overall, upgrading to the 'pro power' suite is necessary for accessing a 4-channel oscilloscope in Multisim.