PS: How to remove the model P in figure 1 and put the neckline P in figure 2 on the first picture to look more harmonious, detailed steps.

First, the method of removing the model P in figure 1, using the seal imitation tool, press alt key to select the background color and erase the model.

Second, the method of drawing the neckline P in Figure 2 to the first figure:

1. Open Figure 2, click Select, click Edit-Copy, open Figure 1, click Edit-Paste, and then Figure 2 will be pasted on Figure 1 (two layers).

2. Click on the second layer of the blueprint, delete the white background, select the neckline, delete the part outside the neckline in reverse, and deform the neckline with the free deformation tool to make it match the neckline in Figure 1.