Hello @Heloisa Bueno R.
As @Kyle K. said use the PurePaths dashlet in the AppMon client to connect your PurePaths with transaction data in both Dynatrace and AppMon, whether the transaction started in Dynatrace or in AppMon.
Have a look on the below link for 'How does PurePath visualization help me analyze web requests end-to-end?'
I have been able to drag the metmon and business transactions from appmon to dynatrace according to image 1 but I do not know which dynatrace menu I can see the purepath of the business transaction (which I dragged from appmon to dynatrace).
I know that the servers in my business transaction are already being monitored by Dynatrace ...
Transactions and services > PurePaths > select your linked PurePath, then under Analyze PurePath, select View PurePaths to see the linked PurePath.
Have a look on the below link for the 'PurePaths from AppMon to Dynatrace' and 'PurePaths from Dynatrace to AppMon'.
Below screenshot is from the documented information and you can also follow the link.