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Without further input from asker it is difficult to assist further.<br />
Links and information provided point in the right direction for a general resolution.
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Has an old router B with guest network feature that would like to convert to an access point, whereby users can connect to the guest network from router B. Router A the main router is an Asus router and Router B is a TP link router <br />
Followed the instructions from the below link..<br />
Able to connect to router B normal WiFi ssid and surf web and at the same time it’s able to access internal net work resources. &nbsp;when connect to the guest network, it shows no network connection. <br />
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<a href="https://www.google.com.sg/amp/s/www.cnet.com/google-amp/news/how-to-turn-an-old-wi-fi-router-into-an-access-point/" rel="ugc">https://www.google.com.sg/amp/s/www.cnet.com/google-amp/news/how-to-turn-an-old-wi-fi-router-into-an-access-point/</a><br />
<br />
Saw another link whereby this can be achieved when router A is using the dd-wrt firmware<br />
<a href="https://www.howtogeek.com/153827/how-to-enable-a-guest-access-point-on-your-wireless-network/" rel="ugc">https://www.howtogeek.com/153827/how-to-enable-a-guest-access-point-on-your-wireless-network/</a><br />
<br />
Is there ways to configure when router A is not using dd- wrt firmware and users can get connected to router B guest network?
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Has an old router B with guest network feature that would like to convert to an access point, whereby users can connect to the guest network from router B. Router A the main router is an Asus router and Router B is a TP link router 
Followed the instructions from the below link..
Able to connect to router B normal WiFi ssid and surf web and at the same time it’s able to access internal net work resources.  when connect to the guest network, it shows no network connection. 

https://www.google.com.sg/amp/s/www.cnet.com/google-amp/news/how-to-turn-an-old-wi-fi-router-into-an-access-point/

Saw another link whereby this can be achieved when router A is using the dd-wrt firmware
https://www.howtogeek.com/153827/how-to-enable-a-guest-access-point-on-your-wireless-network/

Is there ways to configure when router A is not using dd- wrt firmware and users can get connected to router B guest network?

Without further input from asker it is difficult to assist further.
Links and information provided point in the right direction for a general resolution.

How to setup access point with guest network

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Wireless networking is anything related to the transfer of data between two (or more) devices without the use of a physical connection, ranging from getting advice on a new Bluetooth headset to configuring sophisticated enterprise level networks.

Wireless Networking

Network security consists of the policies adopted to prevent and monitor authorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, and covers a variety of computer networks; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access.