Answer:
You can import the values from Excel into a line grid using Copy (Ctrl+C) and Paste (Ctrl+V).
First, copy the desired values in Excel using Ctrl+C. Then, click in the target area in the table of the line grid. You can then insert the values using Ctrl+V. Answer the "Replace data" query with "All" (Image 01).
The video shows how to import the coordinates of a line grid from Excel. Furthermore, it shows how to add another line grid coefficient.