Manali reaching best options are discussed here. Best options to reach Manali is Road way from Delhi or Chandigarh. However anyone can reach Manali by Kullu Airport Also.
Sub Forums: How to reach Manali by Train, How to reach Manali by Air, and 1 more.

Best ways to reach Shimla is here. Shimla is well connected from Road ways, Train Ways and Air Ways from the Whole country.
Sub Forums: How to Reach Shimla by Air, How to Reach Shimla by Road, and 1 more.

Best options for reaching Chandigarh are here. Anyone can reach Chandigarh by Road Ways as well as Train Ways as well as Air Ways.
Sub Forums: How to reach Chandigarh by Train, How to reach Chandigarh by Road, and 1 more.

Dharamshala reaching options are here. Best way to Reach Dharamshala is Road Way. This is well connected from near by cities.
Sub Forums: How to Reach Dharamshala by Air, How to Reach Dharamshala by Road, and 1 more.