Data from datagridview going from one screen to another

Question

Good afternoon, I have some data that load a datagridview, this data comes from a query in the database in slq, and in that datagrid I have a column with a chekbox, I wanted to know how to do even when the user ticks in chekbox on the line and this line appears on another screen, it is possible to do this and if yes how can I do it?

follows image that loads datagrid with chekbox forget the error in the image has already been adjusted.

follows the code that loads the screen

 private void ListaGrid()
    {
        try
        {
            SqlCommand separacao = new SqlCommand("usp_SeparacaoPic", conexaoDADOADV(true));
            separacao.CommandType = CommandType.StoredProcedure;
            separacao.ExecuteNonQuery();

            SqlDataAdapter dados = new SqlDataAdapter(separacao);
            DataTable dtLista = new DataTable();
            dados.Fill(dtLista);

            dgw_separacaopic.DataSource = dtLista;

            dgw_separacaopic.Columns["CLIENTE"].ReadOnly = true;
            dgw_separacaopic.Columns["PRODUTO"].ReadOnly = true;
            dgw_separacaopic.Columns["LOTE"].ReadOnly = true;
            dgw_separacaopic.Columns["PEDIDO"].ReadOnly = true;
            dgw_separacaopic.Columns["LIBERACAO"].ReadOnly = true;
            dgw_separacaopic.Columns["ITEM"].ReadOnly = true;
            dgw_separacaopic.Columns["QTDA"].ReadOnly = true;
            dgw_separacaopic.Columns["ESTOQUE"].ReadOnly = true;
            dgw_separacaopic.Columns["OBS"].ReadOnly = true;

        }
        catch
        {
            MessageBox.Show("Não exstem dados digitados para a consulta, por favor verificar!!!");
            return;
        }
    }

 private void button1_Click(object sender, EventArgs e)
    {
        for (Int32 index = 0; index < dgw_separacaopic.Rows.Count; index++)
        {
            if (bool.Parse(dgw_separacaopic.Rows[index].Cells[0].FormattedValue.ToString()) == true)
            {
                MessageBox.Show("teste");
            }

        }
    }

Thanks in advance.