I have a copy of an old running config that I would like to make live on my dell stack. Its saved as a txt file. How can safely perform this operation?
As long as the config comes from the same model switch, and from the same major revision of firmware, it should work. What model switch are you working with? We can get you the correct steps.
You will need to use the copy command to copy the backup configuration you have to the running configuration on the switch. Page 1101 of the cli guide has some information about the copy command.
And here is a KB article that discusses backing up configurations.
The resulting command would look similar to: console#copy tftp://192.168.0.1/backup running-configuration