How to create a custom lookup in Salesforce?

To create a custom lookup in Salesforce you need to follow below given steps.

• From Setup, click the object manager tab
• Click case, then click Fields & Relationships.
• Click Contact Name, then click Edit.
• In the Lookup Filter section, click Show Filter Settings.
• Click the lookup icon and choose Contact Name, then Account ID, then click Insert.
• Choose equals as the operator.
• In the Value/Fields menu, select Field.
• Click the lookup icon and choose Case, then Account ID, then click Insert.
• Ensure the Required radio button and the Active checkbox are selected.
• Click Save.