The graph must be saved as a picture file, then inserted into PowerPoint as a picture.
Copy graphs from the Prism Graph software, paste into Photoshop, Microsoft Paint or other image editing software and save as a jpeg file. Use the Insert > Picture > From File... function of PowerPoint to insert the jpeg file into the poster.
If the graph is in another PowerPoint application, right click on the graph and save it as a picture file, then copy the picture file back into the poster.
