<actions>
        <group id="TestMenu" text="_TestMenu" description="xxx">
        	<!-- 
        		這個(gè)應(yīng)該很好理解, 添加到哪個(gè)組
        		group-id: 唯一
        		anchor: after / before / first / last
        	 -->
            <add-to-group group-id="MainMenu" anchor="last"/>
            <action id="TestAction1" class="com.wind.action.TestAction" text="測試菜單" description="xxx"/>
        </group>
    </actions>

<!-- 
		如下效果為：
			TestMenu
			 - 測試菜單
			 - 測試子菜單
	-->
    <actions>
        <group id="TestMenu" text="_TestMenu" description="xxx">
            <add-to-group group-id="MainMenu" anchor="last"/>
            <action id="TestAction" class="com.wind.action.TestAction" text="測試菜單" description="xxx"/>
        </group>
        <group id="TestSubMenu1" text="_TestSubMenu" description="xxx">
        	<!-- 重點(diǎn)其實(shí)就是這里，想添加到哪就寫對應(yīng)的group-id -->
            <add-to-group group-id="TestMenu" anchor="last"/>
            <action id="TestSubAction1" class="com.wind.action.TestSubAction1" text="測試子菜單" description="xxx"/>
        </group>
    </actions>

package com.wind.action;

import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.PlatformDataKeys;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.ui.Messages;
import org.jetbrains.annotations.NotNull;

/**
 * @author wind
 * @Description 測試菜單執(zhí)行類
 * @createDate 2021/4/13 13:55
 * @updateDate 2021/4/13 13:55
 */
public class TestAction extends AnAction {
    @Override
    public void actionPerformed(@NotNull AnActionEvent event) {
        Project project = event.getData(PlatformDataKeys.PROJECT);
        String txt = Messages.showInputDialog(
                project,
                "請輸入測試內(nèi)容",
                "測試標(biāo)題",
                Messages.getQuestionIcon()
        );

        System.out.println(txt);
    }
}