Read pdf for each page then merge to excel

hi now I can extract text from pdf for each page, but now each table belongs to each excel

like this image

In the image, have 4 pdf and number of table not the same

how can I modify my workflow to achieve this target ?(merge tables to 4 excel)

Main.xaml (12.2 KB)

PO 4501099385 Nanya.pdf (17.0 KB)
This is sample. I just want the center of PO, so I use substring(Microsoft.Activities). Then how I merge each I substringed ?