How to submit two values without resetting the other submitted ones

I want to submit one value but still keep the other one. Because when I press the button for the second one, the value of the first one is overwritten by the second one.

 <div>
                <select name="cityId" class="form-control" >
                    <option>Qytetet</option>

                    <?php
                    $query="SELECT * FROM categories_table_city";
                    $sql=mysqli_query($conn, $query);
                    while ($row=mysqli_fetch_array($sql))
                    { ?>

                        <option value="<?= $row['categorySlug']?>" <?php if (isset($_GET['cityId']) && $_GET['cityId'] == $row['categorySlug']){echo "selected";}?>>
                            <?= $row['categoryName'] ?>
                        </option>

                        <?php
                    }
                    ?>

                </select>

                <button type="submit" class="input-group-text btn btn-danger" id="basic-addon2">
                    Perfundo
                </button>
            </div>
            <div>
                <select name="categoryId" id="" class="form-control">
                    <option>Kategorit</option>

                    <?php
                    $query="SELECT * FROM categories_table";
                    $sql=mysqli_query($conn, $query);
                    while ($row=mysqli_fetch_array($sql))
                    { ?>

                        <option value="<?= $row['categorySlug']?>" <?php if (isset($_GET['categoryId']) && $_GET['categoryId'] == $row['categorySlug']){echo "selected";}?>>
                            <?= $row['categoryName'] ?>
                        </option>

                        <?php
                    }
                    ?>

                </select>
                <button type="submit" class="input-group-text btn btn-danger" id="basic-addon2">
                    Perfundo
                </button>
            </div>

But I still need a button foreach one.