You probably want to use a CONCATENATE or JOIN statement?
When you have loaded tables 1 and 2 (using FROM statement), you can use RESIDENT after that, since they are present in memory.
Might be something like this ....
LOAD * FROM [Table 1 ...];
LOAD * FROM [Table 2 ...];
LOAD * RESIDENT [Table 1 ...];
<CONCATENATE / JOIN>
LOAD * RESIDENT [Table 2 ...];
DROP TABLES [Table 1], [Table 2];
Don't forget the NOCONCATENATE in the sample above, or else the data from Table 1 is loaded twice in Table 1. QV recognizes that Table 1 and the resident load from Table 1 have exactly the same build, so they will be concatenated automatically, unless you use the NOCONCATENATE statement first.