Footings in shed slab

Gidday. I'm in the process of organising a shed slab on my property. Its 16m x 14m with 19 @ 300 x 300 x 400 deep footings for posts. I'll be using Vizscreen (spelling?) under the slab and will be pouring in one go. I'm wondering what you do with the plastic where it runs over the footing holes. Is it just a matter of cutting holes in the plastic where the footing holes are before laying the slab mesh on chairs? Seems a silly question but one that has been rattling around my brain for...

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