What is the process to split a graphic?

I am trying to lengthen a pattern. I need to add an inch on all lines. What would be the correct process to achieve this? Attached is the pattern.

I meant add an inch on the lines bisected by the straight line.

I will rotate the shape up on the line, insert nodes, break them and pull the bottom part down the number of mm that I want. Then I will add the missing holes and connect the shapes again.

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OOOOh right I get you. Thank you very much.