li 서울을 선택하면 동시에 option 서울이 선택되게 하려면 어떻게 해야 하나요?

비타주리 님, 답변 감사합니다
주신 소스 공부했습니다.

군구가 선택이 안됩니다.


<li class="dev_tab" onclick="sessionStorage.you='서울'"><a href="<?php echo G5_BBS_URL; ?>/board.php?bo_table=gooin&sca=&sfl=wr_7&stx=서울">서울</a></li>
<li class="dev_tab" onclick="sessionStorage.you='경기'"><a href="<?php echo G5_BBS_URL; ?>/board.php?bo_table=gooin&sca=&sfl=wr_7&stx=경기">경기</a></li>
<li class="dev_tab" onclick="sessionStorage.you='인천'"><a href="<?php echo G5_BBS_URL; ?>/board.php?bo_table=gooin&sca=&sfl=wr_7&stx=인천">인천</a></li>
......


<div class="search_box">
<select name="stx" id="wr_7" required onchange="categoryChange(this)">
<option value="">시/도 선택</option>
<option value="서울">서울</option>
<option value="경기">경기</option>
<option value="인천">인천</option>
......
</select>
</div>

<div class="search_box">
<select name="stx" id="wr_8" required>
<option>군/구 선택</option>
</select>
</div>

<script>
if (sessionStorage.you) wr_7.value = sessionStorage.you;
if (sessionStorage.you) wr_8.value = sessionStorage.you;
</script>



<script>

function categoryChange(e) {
const state = document.getElementById("wr_8");

const gangwon = ["강릉시","동해시","삼척시","속초시","원주시","춘천시","태백시","고성군","양구군","양양군","영월군","인제군","정선군","철원군","평창군","홍천군","화천군","횡성군"];
const gyeonggi = ["고양시","과천시","광명시","광주시","구리시","군포시","김포시","남양주시","동두천시","부천시","성남시","수원시","시흥시","안산시","안성시","안양시","양주시","오산시","용인시","의왕시","의정부시","이천시","파주시","평택시","포천시","하남시","화성시","가평군","양평군","여주군","연천군"];
const gyeongsangnam = ["거제시", "김해시", "마산시", "밀양시", "사천시", "양산시", "진주시", "진해시", "창원시", "통영시", "거창군", "고성군", "남해군", "산청군", "의령군", "창녕군", "하동군", "함안군", "함양군", "합천군"];
const gyeongsangbuk = ["경산시","경주시","구미시","김천시","문경시","상주시","안동시","영주시","영천시","포항시","고령군","군위군","봉화군","성주군","영덕군","영양군","예천군","울릉군","울진군","의성군","청도군","청송군","칠곡군"];
const gwangju = ["광산구", "남구", "동구", "북구", "서구"];
const daegu = ["남구", "달서구", "동구", "북구", "서구", "수성구", "중구", "달성군"];
const daejeon = ["대덕구", "동구", "서구", "유성구", "중구"];
const busan = ["강서구","금정구","남구","동구","동래구","부산진구","북구","사상구","사하구","서구","수영구","연제구","영도구","중구","해운대구","기장군"];
const seoul = ["강남구","강동구","강북구","강서구","관악구","광진구","구로구","금천구","노원구","도봉구","동대문구","동작구","마포구","서대문구","서초구","성동구","성북구","송파구","양천구","영등포구","용산구","은평구","종로구","중구","중랑구"];
const ulsan = ["남구","동구","북구","중구","울주군"];
const incheon = ["계양구","남구","남동구","동구","부평구","서구","연수구","중구","강화군","옹진군"];
const jeonnam = ["광양시","나주시","목포시","순천시","여수시","강진군","고흥군","곡성군","구례군","담양군","무안군","보성군","신안군","영광군","영암군","완도군","장성군","장흥군","진도군","함평군","해남군","화순군"];
const jeonbuk = ["군산시", "김제시", "남원시", "익산시", "전주시", "정읍시", "고창군", "무주군", "부안군", "순창군", "완주군", "임실군", "장수군", "진안군"];
const jeju = ["서귀포시","제주시","남제주군","북제주군"];
const chungbuk = ["제천시","청주시","충주시","괴산군","단양군","보은군","영동군","옥천군","음성군","증평군","진천군","청원군"];


if (e.value == "강원") {
add = gangwon;
} else if (e.value == "경기") {
add = gyeonggi;
} else if (e.value == "경남") {
add = gyeongsangnam;
} else if (e.value == "경북") {
add = gyeongsangbuk;
} else if (e.value == "광주") {
add = gwangju;
} else if (e.value == "대구") {
add = daegu;
} else if (e.value == "대전") {
add = daejeon;
} else if (e.value == "부산") {
add = busan;
} else if (e.value == "서울") {
add = seoul;
} else if (e.value == "울산") {
add = ulsan;
} else if (e.value == "인천") {
add = incheon;
} else if (e.value == "전남") {
add = jeonnam;
} else if (e.value == "전북") {
add = jeonbuk;
} else if (e.value == "제주") {
add = jeju;
} else if (e.value == "충남") {
add = chungnam;
} else if (e.value == "충북") {
add = chungbuk;
}

state.options.length = 1;
// 군/구 갯수;

for (property in add) {
let opt = document.createElement("option");
opt.value = add[property];
opt.innerHTML = add[property];
state.appendChild(opt);
}
}
</script>

비타주리 님,
위의 소스를 시도 공부해 보았습니다.
잘 작동하고 있습니다
감사합니다.

혹시 다른 방법도 있나요?