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if (!$_POST['sel_product_category'] ) {
$arrErrors['sel_product_category'] = 'Please provide a category name for your Product.';
}
<label for="sel_product_category">Product Category:</label>
<input name="sel_product_category" type="Text" id="sel_product_category" value="">
Not sure what you mean. If the link points to another part of your website then it's pretty easy by just setting s session variable on the new page.
If the link points to an external website then you just need to go via an intermediate page on your own site first (you'll have seen this done on other sites):