You can assign the Account field per issue, which makes it automatically log against the right account.
There's also a way of logging the Account per worklog, which makes it possible to select the appropriate account at Worklog level. More information about that can be found here: https://tempoplugin.jira.com/wiki/display/TEMPO/Account+as+a+Worklog+Attribute
I have updated my answer with information on that. I must point out I have no experience on using this feature. As far as I know you can log work against an account in the work log field, but if none is selected the account that has been set on issue level will be logged against.
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