Is it possible to set a "goal column" for 'beginning-of-line'?

[Herbert Euler]

Hello everyone,

The command 'beginning-of-line' moves point to column 0
by default. Is it possible to set a "goal column," so that
this command moves point to that column, e.g. column 7,
rather than 0? The content before such column will become
irreachable in this situation (but it might still be displayed).

In another word, is there a vertical version of narrowing
(but perhaps don't try to hide something)?

Thanks in advance.

Regards,
Guanpeng Xu

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