There is no way other then copy paste one line at a time as the CSS will go into differnt modes as depend upon the type of command you have typed in config mode.
Suppose after config mode you go into owner mode.
Then from owner mode you go to to content mode.
SO you can copy paste the commands which are applicable in that mode . All commands applicable for the same mode can be pasted all at a time but commands for differnt mode cannot be pasted in a one go.
Like after creating content , when entering the parameters for the content then you can paste more then one line if all those commands are applicable in content mode only.
There is no way like you asked because we also work like this in the starting, even sometimes adding more then one line hangs the css also. SO be cautious.
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