functions.php

add_filter( 'submit_job_form_fields', 'heynwa_custom_job_fields', 999999999999 );

function heynwa_custom_job_fields( $fields ) {

	if ( isset( $fields[ 'company' ][ 'products' ] ) ){

		if( isset( $fields['company']['products']['options'] ) && ! empty( $fields['company']['products']['options'] ) ){
			
			$options = $fields['company']['products']['options'];
			// To find out the specific ID of the "products" you can either add &debug to the end of the URL when viewing the company fields
			// in admin area (then scroll down until you find them), or go to the products page and get the actual ID
			if( isset( $options[894] ) ) unset( $fields['company']['products']['options'][894] );
			if( isset( $options[892] ) ) unset( $fields['company']['products']['options'][892] );
			if( isset( $options[896] ) ) unset( $fields['company']['products']['options'][896] );
			if( isset( $options[895] ) ) unset( $fields['company']['products']['options'][895] );

		}

	}

	return $fields;
}