How to quickly index thousands of subpages?

create sitemap of websites pages and submit it to Google and Bing webmaster tool, It helps to indexing.

you can index using ping website but they has constraint of 10 pages at a time.

create a sitemap in 2 different formats HTML & XML and submit in google search console

You can index your webpage in google search console

The easiest way is to submit your website's XML sitemap to the search console. You can also use the website's RSS Feed to syndicate your content worldwide, it also helps indexing.

Use Google Webmaster API to index thousands of subpages in google. In Bing, just use the sitemap indexing option

Use Google Webmaster API to index thousands of subpages in google.

There are many ways through which you can achieve your goal and some of them are, submit your website in Google and Bing webmaster tool, create sitemap of pages and submit it to Google and Bing webmaster tool, build quality back-links etc.

I can submit 500 pages per day with search console API, It will index within 24 hours.
Paid Task, contact me on onlinedrifts@gmail.com

By Submitting Sitemap of all subpages

create a sitemap in 2 different formats HTML & XML and submit in google search console

I think you need to submit a sitemap in the google search console.

How to quickly index thousands of subpages?

make a proper list of these links with good heading and post them as a blog in Blogspot, then crawl it into the search console of that blogspot. They will crawl soon.

Google search console

google search console is the option

google search console

Use Google Webmaster API to index thousands of subpages in google.
In Bing, just use the sitemap indexing option

I think you need to submit a sitemap in the google search console.

Make them linked to each other (at least categorized) too, not just from-to the main page, then build a site-map and let G know about it. You may speed the process up by submitting the main page into several SEs and Directories (eg. at http://wx.cm/0Ky ).