ureech,
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<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
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let html = $('.modal-body').html();
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let btn = event.relatedTarget;
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$('.modal-body').html(content);
})
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<body>
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<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
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</button>
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<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
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<h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
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...content
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<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Save changes</button>
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<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal" data-content="12345" >
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</button>
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Запустить модальное окно 00000
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