How to retrieve values from json object using awk or sed

Using jq:

$ printf '%s\n' "$Group_ID" | jq '.[] | select(.name == "Admin_UserGroup")'
{
  "id": "89f3bd6a-33a9-4e02-9fe3-eae660c5a6cf",
  "name": "Admin_UserGroup",
  "path": "/Admin_UserGroup",
  "subGroups": []
}

This selects all objects in the array whose name key corresponds to a value of Admin_UserGroup.

According to your consideration for basic commands, if your file has structure exactly as shown, grep may help you:

$ grep -B2 -A3 '"name" : "Admin_UserGroup"' File

but if all in one line:

$ sed -E 's/\},\s*\{/\},\n\{/g' File | grep  '"name" : "Admin_UserGroup"'

Using your original example, you'd use my solution like so:

$ echo "$Group_ID" | grep ...

You can use JSON.awk:

awk -f JSON.awk -v file1.json file2.json

https://github.com/step-/JSON.awk