Below is my create table

CREATE TABLE ticket(
  -- Do not change any column that begins with tkt_
  tkt_id INTEGER PRIMARY KEY,
  tkt_uuid TEXT UNIQUE,
  tkt_mtime DATE,
  -- Add as many field as required below this line
  assigned_To TEXT,
  type TEXT,
  status TEXT,
  subsystem TEXT,
  priority TEXT,
  severity TEXT,
  foundin TEXT,
  private_contact TEXT,
  resolution TEXT,
  title TEXT,
  comment TEXT
);

Below is my TH1 Script to initialize variable

set type_choices {
   Need_To_Discuss
   Question
   Code_Defect
   Build_Problem
   Documentation
   Feature_Request
   Incident
}
set assigned_To_choices {
  Joe
  Mama
  Both
}
set priority_choices {
  Immediate
  High
  Medium
  Low
  Zero
}
set severity_choices {
  Critical
  Severe
  Important
  Minor
  Cosmetic
}
set resolution_choices {
  Open
  Fixed
  Rejected
  Unable_To_Reproduce
  Works_As_Designed
  External_Bug
  Not_A_Bug
  Duplicate
  Overcome_By_Events
  Drive_By_Patch
}
set status_choices {
  Open
  Verified
  Review
  Deferred
  Fixed
  Tested
  Closed
}
set subsystem_choices {
}

Below is my new ticket page

<th1>
  if {[info exists submit]} {
     set status Open
     submit_ticket
  }
</th1>
<h1 align="center">Enter A New Bug Report</h1>
<table cellpadding="5">
<tr>
<td colspan="2">
Enter a one-line summary of the problem:<br>
<input type="text" name="title" size="60" value="$<title>">
</td>
</tr>

<tr>
<td align="right">Type:
<th1>combobox type $type_choices 1</th1>
</td>
<td>What type of ticket is this?</td>
</tr>

<tr>
<td align="right">Assign To:
<th1>combobox type $assigned_To_choices 1</th1>
</td>
<td>Who is this ticket assigned to?</td>
</tr>

<tr>
<td align="right">File:
<input type="text" name="foundin" size="20" value="$<foundin>">
</td>
<td>In what file did you observe the problem?</td>
</tr>

<tr>
<td align="right">Severity:
<th1>combobox severity $severity_choices 1</th1>
</td>
<td>How debilitating is the problem?  How badly does the problem
affect the operation of the product?</td>
</tr>


<tr>
<td colspan="2">
Enter a detailed description of the problem.
For code defects, be sure to provide details on exactly how
the problem can be reproduced.  Provide as much detail as
possible.
<br>
<th1>set nline [linecount $comment 50 10]</th1>
<textarea name="comment" cols="80" rows="$nline"
 wrap="virtual" class="wikiedit">$<comment></textarea><br>
<input type="submit" name="preview" value="Preview">
</tr>

<th1>enable_output [info exists preview]</th1>
<tr><td colspan="2">
Description Preview:<br><hr>
<th1>wiki $comment</th1>
<hr>
</td></tr>
<th1>enable_output 1</th1>

<tr>
<td align="right">
<input type="submit" name="submit" value="Submit">
</td>
<td>After filling in the information above, press this button to create
the new ticket</td>
</tr>
<tr>
<td align="right">
<input type="submit" name="cancel" value="Cancel">
</td>
<td>Abandon and forget this bug report</td>
</tr>
</table>

drh added on 2009-09-19 14:22:11:
The line in your customized new-ticket script that says:

<th1>combobox type $assigned_To_choices 1</th1>

Should say:

<th1>combobox assigned_To $assigned_To_choices 1</th1>