Lookup Parameter with Sub-Menus

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I'm working on updating dynamic blocks for work so that we can extract the data to Excel and count components more easily. The units I'm working on are shelving sections and the last part I need to work out is accounting for the uprights. My idea is to use a lookup parameter to select the height of the uprights, with each choice leading to a sub-menu of standard extension sizes/combinations. I haven't found a solution to this, although in Autodesk's help pages I found a picture depicting what I'd like to do (though without explanation; it simply refers to the reverse lookup funtion). For my purposes, 'Height' would be replaced by 'Uprights' and 'Width' would be replaced with 'Extensions'.
The link to the page is: https://knowledge.autodesk.com/support/autocad/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/AutoC...
The selections wouldn't change the block visually at all; they would simply be a piece of data in the properties table to extract for counting.
Additionally, and this may be wishful thinking, but is there a way to allow multiple selections to be checked simultaneously? For example, if you were to select the upright height and needed two different extensions, is there a way to select both?
Thanks for any help and sorry if this is a repeat topic.