Not sure where you’ve selected the group, whether in the Navigation Sidebar or in the Item List.
tell application id "DNtp"
try
#-- Window root
#set theGroup to root of viewer window 1
#-- Current group
#set theGroup to current group
-- Selected record
set theRecords to selected records
if theRecords = {} then error "Please select a group in the item list."
if (type of (item 1 of theRecords) as string) is in {"group", "«constant DTgr»"} then
set theGroup to item 1 of theRecords
set theGroup_Name to name of theGroup
if theGroup_Name contains "/" then set theGroup_Name to my escapeSlash(theGroup_Name)
set theGroup_LocationAndName to (location of theGroup) & theGroup_Name
set X to create location theGroup_LocationAndName & "/" & "Test"
else
error "Please select a group in the item list."
end if
on error error_message number error_number
if the error_number is not -128 then display alert "DEVONthink" message error_message as warning
return
end try
end tell
on escapeSlash(theText)
set d to AppleScript's text item delimiters
set AppleScript's text item delimiters to "/"
set theTextItems to every text item of theText
set AppleScript's text item delimiters to "\\/"
set theText_escaped to theTextItems as string
set AppleScript's text item delimiters to d
return theText_escaped
end escapeSlash