Information about resizing a particular VM disk drive can be found in the inline help within the category titled, Virtual Machines, under the section labeled 'Modify a VM Drive'.
Some items of note:
NOTE: If the VM configuration is set to allow hot-plugging, the disk interface is set to 'Virtio-SCSI' and the guest Operating System (OS) supports it, drive size usually can be added without power cycling the VM.
WARNING: Drives cannot be reduced in size. (Inside the guest OS, Partitions may be able to be resized but not drives.)
WARNING: Modifications to drive size will most likely require corresponding modifications within the guest Operating System to use the newly created space.
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