1. Create a session variable in the parent bot used with the Open Excel action
2. Create a session variable in the child bot, and mark it as "use as input"
3. In the parent bot, use the Task Bot: Run action to call the child bot, mapping the session from parent to child.

Thanks for the answer, but I still can't make it work. I don't understand the process.

Where in the documentation can I see this process of setting up a child bot in practice? Thanks

https://docs.automationanywhere.com/bundle/enterprise-v2019/page/enterprise-cloud/topics/aae-client/bot-creator/commands/share-session-across-bots.html

I don't know what I'm looking at anymore 😥

Thanks anyway.

I don't know if I'm late, but have you checked you have the session variable as "output" in your first bot and as "input" in your second bot? You can't pass a variable if that variable is not checked as "output". That way you'll just have an empty variable because the value won't pass from one bot to another.