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How get ONE config pack instead many config files for created lab !!!
1. create a lab, I will no spend a time for it, I thing you know how to.
2. Start all routers and input all configurations what you want to see in pack under each device. For example, for INE lab, copy/paste perconfigs to each device through console.
3. Save all configs on console "wr" for all devices. Now you have saved startup-configs for each, and if you reload devices these will show you waht is configured.
4. IMPORTANT: on each device type this command: " copy running-config unix: "   This like a prototype as in real device disk0:. You can look a content of each device "dir unix:", same as in real hw. Now You have saved config as file under disk "unix:"
5. IMPORTANT: no you should use mass action button Copy all unix://running-config files to database (third button in mass actions, like grey icon with green arrow)
6. Bingo, we got pack for your new lab. Go to tab Laboratories and you will see a created new config pack with the same name as your LAB.
7. After start devices with your config pack, under dir unix: you will see one more file like "config-00001". This is file from where device gets startup config now. number at the end is device number. for R3 it will be 
config-00003, etc...

You can go inside, edit and do anything with it, pack will contains all configs in one.
Do forget that after this action if you want to start your lab with this pack, go to lab edit mode choose it for lab, save.
Then in tab devices (list of devices) use mass action button "stop all devices and wipe all configurations" (like trash).
Now your new created lab starts with your config pack.

Also for better look I suggest to create folders, and drag'n'drop files, as shown in my vm ready to machine.