Select a company by clicking on the Checkmark button on the lower left of the company profile.

After selecting the company or companies you wish to move to a custom list, an Add to custom list button will appear on both your company card and the top of the list.
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Next, you will choose where you want to add the company/companies you selected or if you want to create a new custom list.
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Select a company by clicking on the Checkmark button on the lower left of the company profile.

After selecting the company or companies you wish to remove from a custom list, a Remove button will appear on both your company card and the top of the list.
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Once you click remove you need to confirm the deletion.