In the file you've attached I can't see any control characters within a line. I can only see CRLF at the end of a line. I assume these "control characters" simply mean that your source data is "spread out" over multiple lines.
Are you by any chance transferring the file from Unix to Windows (just a thought).
With your file layout Proc Import will very likely not work but you need to use a data step.
You write that with the delimiters everything is o.k. - so I would have expected that if I read the data just field per field only creating an observation when reading data into the last input column (FLOWOVER), everything should look right. But that's not what I'm getting (see code below) so I assume something else is going on with your source data.
It's no problem to read data from multiple source columns - but what constitutes in your data the start of a new record?
data sample;
infile 'c:\temp\Test_1.txt' dsd dlm='|' flowover lrecl=500 firstobs=2;
input
(
Pln_Tmpl_Assmnt_Itm_Id
Answer_Text Guideline_Text Plan_Template_Assessment_Id PlanTemplateAssessmentItemCmt Question_Text Sequence_Nbr
Source_Created_Date Source_Created_By Source_Last_Updated_Date Source_Last_Updated_By Source_System_Code
Record_Ownership_Code g_snapshot_start_date g_snapshot_end_date g_extract_sk g_extract_name g_current_record_ind
g_deleted_record_ind g_hash_md5 g_insert_job_sk g_update_job_sk g_insert_datetime g_update_datetime
)
(:$20.);
;
run;
