How to setup a sharing rule for more than Accounts to show tickets of same Accounts user in Self Service portal?
 

Steps to create a sharing rules for more than one Accounts:
Note: Please follow KB article (https://communities.bmc.com/docs/DOC-62248) for creating a Text field for having the Account name on Incident object and Workflow rule to update the update the Account name .
1. Create a new user.
2. Assign that user to Account.
3. Create a new Role.Assign users to this Role.
4. Create a sharing Rule for Accounts based on Criteria.

Criteria of sharing Rule -
Account Name equals "Sample acount name".

Useful information:
There is an SFDC platform limit on sharing rules, which I think is currently set at 300 rules per object (including a maximum of 50 criteria based sharing rules). Hence best suggest to go for Apex class sharing rules if number of Accounts are greater than 50 in any Org.