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Two Tables - Two Databases - How to Link

I have 2 databases one will call Database A, made up of the main report and the other Database B, which I'm using to get information from a sub-report.

I have  a database table in A with a Interger field lets say 1234567 is the output
I have a database table in B with a varchar fields lets say C1234567 is the output

Need to get info from table in database B into my report in SSRS, so I can use 2 fields.

I know i either have to strip the C from Database table B and bring it over to Database table A but not sure how?

Or do I create create or convert the field in database table A to string, then add the C then submit that as my parameter for the sub-report to link up table database field in B.

Not sure how to do either. Any help is appreciated. Also please send examples as I still consider a very basic beginner in all this. Thank you for your support.
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If they all start with C, it's easy:
FROM DatabaseA..TableA t1
INNER JOIN DatabaseB..TableA t2
ON t1.MyField=REPLACE(t2.MyField,'C','')

If they all start with a single char, you can use:
ON t1.MyField=RIGHT(t2.MyField,LEN(t2.MyField)-1)

If they have any number of chars, you can use:
ON t2.MyField LIKE '%'+CAST(t1.MyField AS varchar)+'%'

Though this last one will be less efficient.
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Scott Pletcher
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Then, the query is super-easy:

FROM TableA a
INNER JOIN TableB b ON b.column_name_int = a.column_int

Note that you still have the original combined column name available, it is just a computed column now, but it can be used just like any other column name.
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Ok. This looks way over my head so I'm going to explain it in pictures.

See attached.
Your subreport will have to use the exact same parameter as your report. What you have to do is create the subreport query in a way that will strip the C from it. Like:

This way, you can use the same parameter to link the report to the subreport.
So see attached.