[ksa]

Мои 5коп...

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<style>
section {
	margin: 10px;
	border: 1px solid green;
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.item1:nth-child(n+7) {
	display: none;
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.item2:nth-child(n+6) {
	display: none;
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.item1.active,
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<script>
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		o = $(o)
		const n = o.data('max')
		const oi = o.find('[class^="item"]')
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		om.text('еще')
		o.on('click', _ => {
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			om.text('')
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<section id="id-1" data-max='6'>
	<div class="item1">1</div>
	<div class="item1">2</div>
	<div class="item1">3</div>
	<div class="item1">4</div>
	<div class="item1">5</div>
	<div class="item1">6</div>
	<div class="item1">7</div>
	<div class="item1">8</div>
	<div class="more"></div>
</section>
<section id="id-2" data-max='5'>
	<div class="item2">1</div>
	<div class="item2">2</div>
	<div class="item2">3</div>
	<div class="item2">4</div>
	<div class="item2">5</div>
	<div class="item2">6</div>
	<div class="item2">7</div>
	<div class="item2">8</div>
	<div class="more"></div>
</section>