My specific question is in installing new plumbing under a slab.
When I pour the floor repair, I will set the drain in the slab repair. Can I also do the first sloping for the vinyl pan with this repair, spreading the concrete and mortar out to the edges?

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Originally Posted by seatofpants

My specific question is in installing new plumbing under a slab.
When I pour the floor repair, I will set the drain in the slab repair. Can I also do the first sloping for the vinyl pan with this repair, spreading the concrete and mortar out to the edges?

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You need instructions bad! You're in trouble already if you're going to attempt to pan the shower to a sloped floor. The shower pan sets on a level floor and the mortar is sloped to a flange type shower drain,(see image).
For instructions on setting a pan for a custom tile shower base click on;
Mortar Bed Shower Floor for Tile Showers
Good luck, Tom