How to include a launch file from another node into a current project

edit

I am launching a specific node called roslaunch lidar_deck lidar_deck_rosbag.launch

I created another node called tugInterface, and that also has a launch file called roslaunch tugInterface tuginterface.launch. I circled it in red below.

The problem:

I am trying to include the launch file called roslaunch tugInterface tuginterface.launch into the roslaunch lidar_deck lidar_deck_rosbag.launch but with no success.

Below the lidar_deck lidar_deck_rosbag.launch:

<?xml version="1.0" ?>
<launch>
  <param name="/use_sim_time" value="false"/>
  <node pkg="tf" type="static_transform_publisher" name="segment_frame" args="0 0 0 0 0 0 1 base_footprint segment_frame 10"/>

  <node pkg="lidar_boat_detection" type="process_lidar" name="process_lidar" />
  <node pkg="tf" type="static_transform_publisher" name="velodyne_bag_tranform" args="0 0 0 0 0 0 1 base_footprint velodyne 10"/>
  <!-- RViz -->
  <arg name="rviz" default="true"/>
  <node if="$(arg rviz)" pkg="rviz" type="rviz" name="$(anon rviz)" respawn="false" args="-d $(find lidar_deck)/rviz/lidar_deck_rosbag.rviz" />

</launch>

I tried also the following version but that also did not work:

<?xml version="1.0" ?>
<launch>
  <param name="/use_sim_time" value="false"/>
  <node pkg="tf" type="static_transform_publisher" name="segment_frame" args="0 0 0 0 0 0 1 base_footprint segment_frame 10"/>

  <node pkg="lidar_boat_detection" type="process_lidar" name="process_lidar" />
  <node pkg="tf" type="static_transform_publisher" name="velodyne_bag_tranform" args="0 0 0 0 0 0 1 base_footprint velodyne 10"/>

<include file="$(find tugInterface)/launch/tuginterface.launch" />
<node pkg="tugInterface" type="tuginterface" name ="tuginterface" />

  <!-- RViz -->
  <arg name="rviz" default="true"/>
  <node if="$(arg rviz)" pkg="rviz" type="rviz" name="$(anon rviz)" respawn="false" args="-d $(find lidar_deck)/rviz/lidar_deck_rosbag.rviz" />

</launch>

In addition to that I also tried to add <rosparam command="load" file="$(find tugInterface)/tuginterface.launch" /> to the launch file but still didn't work. How can I solve that? Thanks for pointing to the right direction.