I am trying to add multiple column into Magento 2 admin custom module. I have added screen shot for more details. Which explain what I am looking for.
Please share your ideas and help.
add menu.xml to your custom module app/code/[Vendor]/[Module]/etc/adminhtml/menu.xml
<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Backend:etc/menu.xsd">
<menu>
<add id="Vendor_Module::menu1" title="Menu 1" module="Vendor_Module" sortOrder="120" parent="Magento_Reports::report" resource="Vendor_Module::menu1"/>
<add id="Vendor_Module::test1" title="Test 1" module="Vendor_Module" sortOrder="10" parent="Vendor_Module::menu1" action="route/controller/action" resource="Vendor_Module::test1"/>
<add id="Vendor_Module::menu2" title="Menu 2" module="Vendor_Module" sortOrder="130" parent="Magento_Reports::report" resource="Vendor_Module::menu2"/>
<add id="Vendor_Module::test2" title="Test 2" module="Vendor_Module" sortOrder="10" parent="Vendor_Module::menu2" action="route/controller/action" resource="Vendor_Module::test2"/>
</menu>
</config>
this will be add menu in Reports you can change parent by your need replace with it "Magento_Reports::report"