Creating a 3D Model with Tinkercad - 3D Printing: Build your Own 3D Printer and Print your own 3D Objects - page 143

Figure 7.19 Grouped letters.
After converting the letters to holes and dragging the group (“Hello World”) into
the medallion, I drag the group and place it where desired as shown in Figure 7.20 .
Figure 7.20 Place the letters inside the medallion.