How to save multiple tables related to each other with Prisma

You can try out the following:

prisma.table2.create({
  data: {
    table1: {
      createMany: {
        data: [
          {
            secondaryfield: 'table1-1',
          },
          {
            secondaryfield: 'table1-2',
          },
        ],
      }
    }
  }
})

More info here