I'm wondering if there is a way using Apex to create three levels of dependent, multi-select picklists. The use case is we have customers (Accounts) that have several product lines, and we need to be able to identify the top level of product line, along with two levels deeper of modules and services that go with it, for each product line they have. I need these to be fields as opposed to using custom objects because through the Marketo integration, marketing needs to be able to pull accounts for upsell campaigns based on the values in these fields on the Account. Is there any way that this can be done? I've seen other posts, but they all used regular picklists, not multi-select. Any help woudl be appreciated!