The snippet creates a catalog item with all possible variables types and orders the created item with dummy data.

cat_item_with_all_variables.js

var varObj = {
	1: { name: 'YES_NO', value: 'No' },
	2: { name: 'MULTI_LINE_TEXT', value: '1\n2' },
	3: { name: 'MULTIPLE_CHOICE', value: 'second' },
	4: { name: 'NUMERIC_SCALE', value: '2' }, // 0 - 5 by default
	5: { name: 'SELECT_BOX', value: 'software' }, // Incident category
	6: { name: 'SINGLE_LINE_TEXT', value: 'Dummy text' },
	7: { name: 'CHECKBOX', value: true },
	8: { name: 'REFERENCE', value: '57af7aec73d423002728660c4cf6a71c' }, // OOTB incident
	9: { name: 'DATE', value: '2022-01-07' },
	10: { name: 'DATE_TIME', value: '2022-01-07 06:05:33' },
	11: { name: 'LABEL', value: '' },
	12: { name: 'BREAK', value: '' },
	// 13 does not exist
	14: { name: 'CUSTOM', value: '' },
	15: { name: 'UI_PAGE', value: '' },
	16: { name: 'WIDE_SINGLE_LINE_TEXT', value: 'Long long string...' },
	17: { name: 'CUSTOM_WITH_LABEL', value: '' },
	18: { name: 'LOOKUP_SELECT_BOX', value: '2' }, // In Progress incident state
	19: { name: 'CONTAINER_START', value: '' },
	20: { name: 'CONTAINER_END', value: '' },
	21: { name: 'LIST_COLLECTOR', value: '9d385017c611228701d22104cc95c371,e8caedcbc0a80164017df472f39eaed1' }, // OOTB incidents
	22: { name: 'LOOKUP_MULTIPLE_CHOICE', value: '3' }, // On Hold incident state
	23: { name: 'HTML', value: '<h1>Hello World</h1>' },
	24: { name: 'CONTAINER_SPLIT', value: '' },
	25: { name: 'MASKED', value: 'password' }, // Any string
	26: { name: 'EMAIL', value: '[email protected]' },
	27: { name: 'URL', value: 'https://google.com/search?q=ServiceNow' },
	28: { name: 'IP_ADDRESS', value: '1.1.1.1' },
	29: { name: 'DURATION', value: '1 01:01:01' },
	// 30 does not exist
	31: { name: 'REQUESTED_FOR', value: '6816f79cc0a8016401c5a33be04be441' }, // System administrator
	32: { name: 'RICH_TEXT_LABEL', value: '' },
	33: { name: 'ATTACHMENT', value: '40f93e16c0a801130137c1f1bf538539' } // OOTB attachment
};


var catItemID = createCatalogItem();
createVariables(catItemID);
orderItem(catItemID);

function createCatalogItem() {
	var catItemGR = new GlideRecord('sc_cat_item');
	catItemGR.initialize();
	catItemGR.setValue('name', 'Test item with all variables');
	return catItemGR.insert();
}

function getSkippedTypes() {
	var skippedTypes = [];
	for (var type in varObj) {
		var dummyValue = varObj[type].value;
		if (!dummyValue) {
			skippedTypes.push(type);
		}
	}
	return skippedTypes;
}

function createVariables(catItemID) {
	var skippedTypes = getSkippedTypes();
	var choiceGR = new GlideRecord('sys_choice');
	choiceGR.addQuery('name', 'question');
	choiceGR.addQuery('element', 'type');
	choiceGR.addQuery('inactive', false);
	choiceGR.addQuery('value', 'NOT IN', skippedTypes.join());
	choiceGR.orderBy('sequence');
	choiceGR.query();
	while (choiceGR.next()) {
		var varType = choiceGR.getValue('value');
		var varName = choiceGR.getValue('label');
		var order = choiceGR.getValue('sequence');
		var variableGR = new GlideRecord('item_option_new');
		variableGR.initialize();
		variableGR.setValue('cat_item', catItemID);
		variableGR.setValue('type', varType);
		variableGR.setValue('question_text', varName);
		variableGR.setValue('name', 'variable_' + varType);
		variableGR.setValue('order', order);
		if (varObj[varType].name == 'LIST_COLLECTOR') {
			variableGR.setValue('list_table', 'incident');
		} else if (varObj[varType].name == 'LOOKUP_MULTIPLE_CHOICE') {
			variableGR.setValue('lookup_table', 'incident');
			variableGR.setValue('lookup_value', 'state');
			variableGR.setValue('lookup_unique', true);
		} else if (varObj[varType].name == 'LOOKUP_SELECT_BOX') {
			variableGR.setValue('lookup_table', 'incident');
			variableGR.setValue('lookup_value', 'state');
			variableGR.setValue('lookup_unique', true);
		} else if (varObj[varType].name == 'REFERENCE') {
			variableGR.setValue('reference', 'incident');
		} else if (varObj[varType].name == 'SELECT_BOX') {
			variableGR.setValue('choice_table', 'incident');
			variableGR.setValue('choice_field', 'category');
		}
		var variableID = variableGR.insert();
	
		if (varObj[varType].name == 'MULTIPLE_CHOICE') {
			var questionChoiceGR = new GlideRecord('question_choice');
			questionChoiceGR.initialize();
			questionChoiceGR.setValue('question', variableID);
			questionChoiceGR.setValue('text', 'First');
			questionChoiceGR.setValue('value', 'first');
			questionChoiceGR.setValue('order', '100');
			questionChoiceGR.insert();
	
			questionChoiceGR.initialize();
			questionChoiceGR.setValue('question', variableID);
			questionChoiceGR.setValue('text', 'Second');
			questionChoiceGR.setValue('value', 'second');
			questionChoiceGR.setValue('order', '200');
			questionChoiceGR.insert();
		}
	}
}

function getVarDataObj() {
	var varDataObj = {};
	for (var type in varObj) {
		var dummyValue = varObj[type].value;
		if (dummyValue) {
			varDataObj['variable_' + type] = dummyValue;
		}
	}
	return varDataObj;
}

function orderItem(catItemID) {
	var varDataObj = getVarDataObj();
	var cart = new sn_sc.CartJS();
	var request = {
		'sysparm_id': catItemID,
		'sysparm_quantity': '1',
		'variables': varDataObj
	};
	var cartDetails = cart.orderNow(request);
	gs.info(cartDetails);
}