You have placed several external Drawings in Archicad which have now moved location in your local file system. Relinking them one by one will consume a lot of your time, and all of them are still placed in a single folder, only one portion of the path has changed.
Solution
1. Go to File > External Content > Drawing Manager.
2. Select multiple Drawings by pressing the Shift key (files should be located in the same folder path structure)
3. This will enable a new icon in the Drawing manager with the function 'Read from...' (screenshots below).
2. Click on the folder icon with the link symbol.
4. When the window Relink Drawing pops up, select the option from local file system.
5. Click Browse...
6. Select the new folder path.
7. Click OK.
The drawing files will be read from the new folder.