How to seperate electromiography waves from one whole .txt file to seperate collums.

Hellow, I got one .txt file with 112 electomiography wave data and pause intervals. But i got data in one big text file as one collum. Is it posible to transfer every single wave to separate collum (1,2,3,4,-112) and discard rest periods (pause) using matlab? Or should i manualy cut/paste every single wave to excel sheet and then import to matlab?

(the wave lenght is 5s. and rest perionds are 18s. and 1000hz / 1s. registering rate)

I think i could be something like:

Sheet1(1)=data(1:5000); Sheet1(2)=data(23000:28000); Sheet1(3)=data(46000:51000);

But i still dont know actual code. Can you help?