How do I populate a listbox with a list excluding values found in another listbox?

Hi all,

I have a userform where I can select multiple items in a listbox and add them to another. I also have the ability to filter the first listbox to make finding items easier. The issue I am having concerns the clear filter button. As currently designed, the clear filter button will reset the initial listbox back to its default values. Ideally, I would like it to reset to the default values excluding those values that currently in the second listbox.

Thanks in advance for any help you can provide. The entire code is below for reference, but it's the sub ClearFilter_Click that I am struggling with.

Brendon

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Thank you for your quick reply! This works perfectly.